Keuffel and Esser, Standard Scales

Keuffel & Esser Co., Hoboken, New York, sold and manufactured slide rules, drawing instruments and other technical supplies. Established in 1884, sold rules from 1886, began manufacturing their own rules in 1891 and continued until 1976. Over the course of their history Keuffel & Esser became the largest manufacturer of slide rules in the US. In 1967, Keuffel & Esser, commissioned a study of the future. The report predicted that, by the year 2067, Americans would live in domed cities (possibly influenced by Issac Asimov's robot novel Caves of Steel) and watch three-dimensional television. Unfortunately for the company, the report failed to predict that slide rules would be obsolete in less than ten years, replaced by the pocket calculator. By 1976, Keuffel & Esser mothballed its slide rule manufacturing equipment and sent it to the Smithsonian Institution. They transitioned into CAD equipment in the 1980's.
For more detail, dating and related history go to the K&E Catalog Page by Clark McCoy.

This gallery begins with the long 20" slide rules, then continues by model number, sorted by date of manufacturer.

ISRM K&E 4078

Detail of 4078 factory markings

K&E 4078 Production Lot #7. 1900 Made in Germany for K&E by Dennert & Pape. W. Cox patent Oct 6, 1891. Shown in 1900 catalog Front Scale: A [ B, C ] D Back Scale: A [ BI, CI ] D Note: First of the 20" long Duplex's. With Brass Indicator (Chisel Cursor). The only known specimen of this model.

ISRM K&E 4051-5

L001 K&E 4053-5

L02 K&E 4081-5 20in

L08 K&E 4088-5 20in All-glass cursor

ISRM K&E N4088-5 20in Improved cursor

L07 K&E 68-1608 Polyphase

REF K&E Early Import	K&E Early Import Made in France for K&E by Tavernier-Gravet Front Scale 20cm // A [ B, C ] D || 20cm Back Scale: [ S, L, T ] Back: Equivalents (conversion factors) Note: Medaillis d'Or 1878 et 1889 - This means a gold medal for excellence Archive: Herman van Herwijnen SRC
REF K&E 1744 - Cox Patent	K&E 1744 - Cox Patent - Predecessor to 4070 - patent Oct 6, 1891 Made in Germany for K&E by Dennert & Pape. 1900 Front Scale A [ B, C ] D Back Scale A [ BI, CI ] D Archive: Herman van Herwijnen SRC
REF K&E 1744 1/2 - Cox Patent	K&E 1744 1/2 - Cox Patent - Predecessor to 4060 - patent Oct 6, 1891 Made in Germany for K&E by Dennert & Pape. 1900 Front Scale A [ B, C ] D Back Scale A [ BI, CI ] D Archive: Herman van Herwijnen SRC
REF K&E 1746 (D&P)	K&E 1746 (D&P) RR track scales Made in Germany by Dennert & Pape - circa 1888 Front Scale 20cm // A [ B, C ] D \\ 26cm Well: 26-51 cm Back Scale Equivalents [ S, L, T] Archive - Clay Castleberry Collection
P109 K&E 4031	K&E 4031 Made in U.S.A. - Pat June 5, 1900 Front Scale 5inch // A [ B, C ] D || 12cm Back Scale [ S, L, T ] Back: Equivalents
P214 K&E 4031 (Finely Divided)	K&E 4031 (Finely Divided) s/n 302 Made in U.S.A. - Pat June 5, 1900 Front Scale 5inch // A [ B, C ] D || 13.7cm Back Scale [ S, L, T ] Back: Equivalents
REF K&E 4031 Mannheim	K&E 4031 Mannheim c.1909 Made in U.S.A. - Pat June 5, 1900 Front Scale 5inch // A [ B, C ] D || 13.5cm Back Scale [ S, L, T ] Back: Equivalents Scan donated by Paul Tarantolo, Houston, Texas.
P109 K&E 4032	K&E 4032 Made in U.S.A. - Pat June 5, 1900 Front Scale 5inch // A [ B, C ] D \\ 13cm Back Scale [ S, L, T ] Back: Equivalents Original Owner: W.B. Ross (on case and SR) Scan donated by Clay Castleberry, California
S044 K&E American	K&E American Made in U.S.A. Est. date prior to1900 - Boxwood Front Scale 10In // A [ B, C ] D || 25Cm Back Scale [ S, L, T ] Channel: 25 to 52Cm scale
REF K&E 4035 Mannheim	K&E 4035 Mannheim c.1909 Made in U.S.A. - Pat June 5, 1900 Metal framed glass cursor Front Scale 8inch // A [ B, C ] D || 21.2cm Back Scale [ S, L, T ] Back: Equivalents Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4035 Mannheim	K&E 4035 Mannheim c.1921 Made in U.S.A. Frameless glass cursor Front Scale 8inch // A [ B, C ] D || 21.2cm Back Scale [ S, L, T ] Back: Equivalents Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E N4035 Mannheim	K&E N4035 Mannheim sn308600 Made in U.S.A. c.1931 Frameless glass cursor Front Scale 8inch // A [ B, C ] D || 20cm Back Scale [ S, L, T ] Back: Equivalents Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E N4035 Mannheim	K&E N4035 Mannheim sn308715 Made in U.S.A. c.1931 Improved glass cursor Front Scale 8inch // A [ B, C ] D || 21.2cm Back Scale [ S, L, T ] Back: Equivalents Scan donated by Paul Tarantolo, Houston, Texas. Note: The serial number on this K&E N4035 with the improved glass indicator (cursor) predates the offering of that indicator. The improved glass indicator was introduced around 1935-1936. This may have been replaced.
REF K&E 4040 with Chisel Cursor	K&E 4040 with with Chisel Cursor Made in U.S.A. circa 1900 Front Scale 10 Inch // A [ B, C ] D \\ 27 Cm Back Scale Equivalents [ S, L, T ] Well: 27-52cm Scan donated by Clay Castleberry, California
REF K&E 4041 with RR Track Scales	K&E 4041 with RR Track Scales Made in U.S.A. circa 1900 Front Scale 10 Inch // A [ B, C ] D \\ 27 Cm Back Scale Equivalents [ S, L, T ] Scan donated by Clay Castleberry, California
REF K&E 4041-3 with Decimal Keeper	K&E 4041-3 with Decimal Keeper Made in U.S.A. Front Scale Inch // A [ B, C ] D || Cm Back Scale [ S, L, T ] Scan donated by Clay Castleberry, California
ISRM K&E N4041-3	K&E N4041-3 s/n 715559 Made in U.S.A. Front Scale Inch // A [ B, C ] D || Cm Back Scale [ S, L, T ] Original Owner: Roy A. VanBuren Note: Image used from S042 sn 833436 sent to CHM, which has been replaced. The slide rule is currently in Display case D3 and needs to be scanned.
S251 K&E 4053-2 8in Finely Divided	K&E 4053-2 8 inch s/n 25 Made in U.S.A. - Pat June 8, 1900 - Finely-Divided Scales Front Scale (scale labels on right) 8in // A [ B, CI, C ] D || LL Back Scale: [ S, L, T ]
S262 K&E N4053-2 8in Finely Divided	K&E N4053-2 8 inch s/n175230 Made in U.S.A. - Improved cursor - Finely-Divided Scales Front Scale (scale labels on left) 8in // A [ B, CI, C ] D, K  || 20cm Back Scale [ S, L, T ]
REF K&E 4053	K&E 4053 No Model No. Made in U.S.A. - c.1909 Front Scale (scale labels on right) 10in // A [ B, CI, C ] D || K Back Scale [ S, L, T ] Back: Table of Equivalents Scan donated by Paul Tarantolo, Houston, Texas.
S082 K&E 4053	K&E 4053 No s/n or dash number - c1909-1912 Made in U.S.A. - Early Pat June 8, 1900 Front Scale (scale labels on right) 10in // A [ B, CI, C ] D || K Back Scale [ S, L, T ] Back: Table of Equivalents
ISRM K&E 4053-3 (1913)	K&E 4053-3, Production #741, 1913 Made in U.S.A. - with the metal framed cursor Front Scale (scale labels on left) 10in // A [ B, CI, C ] D || K Back Scale [ S, L, T ] Back: Table of Equivalents Original Owner: E.G. Dary '13 Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
ISRM K&E 4053-3 (1915)	K&E 4053-3, Production #317, 1915 Made in U.S.A. (the only year with the metal cursor bars) Front Scale (scale labels on left) 10in // A [ B, CI, C ] D || K Back Scale [ S, L, T ] Back: Table of Equivalents Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
ISRM K&E 4053-3 (1916-1921)	K&E 4053-3 Lot No 545 Made in U.S.A. - 1916 Front Scale 10in // A [ B, CI, C ] D, K || 25cm Back Scale [ S, L, T ] Back: Table of Equivalents Original Owner: Rand Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
ISRM K&E 4053-3 (pre-1922 with 1936 cursor)	K&E 4053-3 Lot #44 pre-1922 Made in U.S.A. Note: 1936 Improved Cursor Front Scale 10in // A [ B, CI, C ] D || K Back Scale [ S, L, T ] Cursor Patent 8-17-15 Back: Table of Equivalents Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ Note: The 1936 K&E Catalog offered their new Improved Cursor Designs that had a hairline on the plastic block as a replacement for older slide rules with scales on the edge. These hairline blocks were not needed or found on 1936-1955 N4053's with the K scale on the face below the D scale. The K scale was moved to face in 1922. The edge became a 25cm linear scale and did not need the extended hairline.   ;   ; 1936 K&E Catalog pages 329, 330 & 331 showing Replacement Cursors
ISRM K&E N4053-3 (1916-1933)	K&E N4053-3 S/N 920438 c1916-1933 Made in U.S.A.- All Glass Cursor, Plastic Blocks (appears to have a plastic replacement for the glass) Patents: Stock 1,934, 232; Cursor: Pat. 8-17-15 Front Scale 10in // A [ B, CI, C ] D, K || 25cm Back Scale [ S, L, T ] Cursor Patent 8-17-15 Back: Table of Equivalents Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
ISRM K&E N4053-3 (c1933-1935)	K&E N4053-3 S/N 178042 c1933-1935 Made in U.S.A. Note: Lens Protection on Cursor Front Scale 10in // A [ B, CI, C ] D, K || 25cm Back Scale [ S, L, T ] Cursor Patent 8-17-15 Back: Table of Equivalents Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
S043 K&E N4053-3	K&E N4053-3 S/N 031010 Made in U.S.A. Front Scale 10in // A [ B, CI, C ] D, K || 25cm Back Scale [ S, L, T ] Back: Table of Equivalents Owned and used by Frank K. Armour, Born Dec 28, 1917 Toledo, Ohio. Died Feb 13, 2004 Louisville, Colorado. Graduate of Cleveland University c1940. Mr. Armour retired Vice President of Engineering for Interlake Steel, in Toledo, Ohio. NotePart of a bulk transfer the Computer History Museum
ISRM K&E N4053-3 with Magnifying Cusor	K&E N4053-3 with Magnifying Cusor Made in U.S.A. - U.S.Military Issue, sn 802716 Patents: Stock: 1,934,232. Cursor: 2.086,502. Front Scale 10in (Broken Off) // A [ B, CI, C ] D, K || 25cm Back Scale [ S, L, T ] Sleeve Marked U.S. on flap.
S095 K&E N4053-3	K&E N4053-3 S/N 464886 Made in U.S.A. Front Scale 10in // A [ B, CI, C ] D, K || 25cm Back Scale [ S, L, T ] Note: The Model was moved to the left side and K&E Added to the slide onthe right
S385 K&E 4053-3 c.1956	K&E 4053-3 c.1956 Made in U.S.A.- Plastic and wood construction Front Scale 10in // A [ B, CI, C ] D, K \\ 25cm Back Scale [ S, L, T ]  Back: Conversion Factors
S275 K&E 4054 Wood Sleeve	K&E 4054  s/n 55, Circa1901-1915 Made in U.S.A. - No laminate on ruler, Early cursor Front Scale 10in // A [ B, C ] D || 26cm Back Scale [ S, L, T ] Check out the mahogany storage sleeve with the tin metal insert.
S036 K&E 4054	K&E 4054 S/N 163668 c1936-1955 Made in U.S.A. - Improved Cursor - added CI and K scales Front Scale A [ B, CI, C ] D, K Back Scale [ S, L, T ]
ISRM K&E 4054	K&E 4054 S/N 291745 c1944-1955 Made in U.S.A. - Improved Cursor - added CI and K scales Front Scale A [ B, CI, C ] D, K Back Scale [ S, L, T ]
S067 K&E 4055	K&E 4055 S/N 526528 c1933-1935 Made in U.S.A. - All Glass cursor with flanged cursor blocks Front Scale A [ B, C ] D Back Scale [ S, L, T ]
S451 K&E 4055	K&E 4055 S/N 567857 c1936-1955 Made in U.S.A. New Improved Cursor Front Scale A [ B, C ] D Back Scale [ S, L, T ]
S086 K&E 4056	K&E 4056 S/N 871157 Made in U.S.A. - Metal frame cursor Front Scale A [ B, C ] D Back Scale [ S, L, T ]
S053 K&E 4056	K&E 4056 S/N 944322 Made in U.S.A. Front Scale A [ B, C ] D Back Scale [ S, L, T ]
ISRM K&E 4058 Student's Slide Rule (pre-1925)	K&E 4058 Student's Slide Rule Made in U.S.A. - Note: all wood framed cursor Front Scale A [ B, C ] D Back Scale [ S, L, T ]
S239 K&E (4058) Beginner's Slide Rule (1925-1929)	K&E (4058) Beginner's Slide Rule Made in U.S.A. - Note: all wood framed cursor Front Scale A [ B, C ] D Back Scale [ S, L, T ] Back : Equivalents (note slight differences from S396 above)
S478 K&E 4058C Beginners Slide Rule (1930)	K&E 4058C Beginners Slide Rule Made in U.S.A. - Note: all wood framed cursor Note: Student hid formulae in well - clever way to cheat Front Scale A [ B, C ] D Back Scale [ S, L, T ] Back : Equivalents (note slight differences from S396 and S239 above)
ISRM K&E 4058W Beginner's Slide Rule (1930-1943)	K&E 4058W Beginner's Slide Rule Made in U.S.A. - Painted white before adding scales. Black Metal framed cursor Front Scale A [ B, C ] D Back Scale Equivalents [ S, L, T ] Donated by David Hecht, Alexandria, Virginia
ISRM K&E 4058W Beginner's Slide Rule (c1943)	K&E 4058W Beginner's Slide Rule Made in U.S.A. - Note difference in Cursor frame: Bright Metal framed cursor Front Scale A [ B,  C ] D Back Scale [ S, L, T ] Previous owner: A loaner from a school's Textbook Department. This may very well be during WWII when limited resources made it difficult for individuals to buy slide rule
ISRM K&E N4058W Beginner's Slide Rule (1954)	K&E N4058W Beginner's Slide Rule Made in U.S.A. - Note: One piece molded clear Plastic Cursor introduced 1954 Front Scale A [ B, CI, C ] D, K Back Scale Equivalents [ S, L, T ]
REF K&E 8858 Beginners (WWII Wartime Loaner)	K&E 8858 Beginners (WWII Wartime Loaner) Made in U.S.A. - 1942 Front Scale: A [ B, C ] D Back Scale: [ S, L, T ] Back: Model number and description of loan terms Note: Issued for deposit of $1 as a loaner to meet war shortage Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4061-T Column Cursor	K&E 4061-T - patent Dec 22, 1908 Made in U.S.A. Front Scale A [ B, S, C ] D Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red A [ BI, T, CI ] D, L Scan donated by Clay Castleberry, California
REF K&E 4061-T All Glass Cursor	K&E 4061-T - patents: June 5, 1900 and Dec 22, 1908 Made in U.S.A. Front Scale A [ B, S, C ] D Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red A [ BI, T, CI ] D, L Scan donated by Clay Castleberry, California
REF K&E 4061 Clamshell Cursor	K&E 4061 c.1909 Made in U.S.A. Front Scale A [ B, C ] D Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red A [ BI, CI ] D Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4061-T (Trig) Clamshell Cursor	K&E 4061-T c.1909 Made in U.S.A. Front Scale A [ B, S, C ] D Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red A [ BI, T, CI ] D || L Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4065-T (Trig)	K&E 4065-T (Trig) - patent Oct 6, 1891 Made in U.S.A. Front Scale A [ B, S, C ] D Back Scale A [ B, T, C ] D Scan donated by Clay Castleberry, California
REF K&E 4065 Clamshell Cursor	K&E 4065 c.1909 Made in U.S.A. Front Scale A [ B, C ] D Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red A [ BI, CI ] D Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4065 Frameless Glass	K&E 4065 c.1915 Frameless glass cursor with metal guides Made in U.S.A. Front Scale A [ B, C ] D Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red A [ BI, CI ] D Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4065-T (Trig) Frameless Glass	K&E 4065-T c.1916 Made in U.S.A. Front Scale A [ B, S, C ] D Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red A [ BI, T, CI ] D, L Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4070 Chisel Cursor	K&E 4070 Chisel Cursor Made in U.S.A.- Note: Patent Oct 6, 1891 Front Scale A [ B, C ] D Back Scale A [ BI, CI ] D Archive: Ted White Collection
S010 K&E 4070-3 Trig	K&E N4070-3 Trig S/N 717360 Made in U.S.A.- Note: Standard trig scales (6,12 divisions/degree) Front Scale K, A [ B, T, ST, S ] D, DI Back Scale DF [ CF, CIF, CI, C ] D, L
S303 K&E 4070-3 Trig	K&E N4070-3 Trig S/N 329774 Made in U.S.A.- Front Scale:  Note: Standard trig scales (6,12 divisions/degree) K, A [ B, T, ST, S ] D, DI Back Scale DF [ CF, CIF, CI, C ] D, L
REF K&E 4071 Clamshell Cursor - 'U' Brackets	K&E 4071 c.1909 Clamshell style metal framed glass indicator with 'U' shaped brackets Made in U.S.A. Front Scale A [ B, C ] D Back Scale: Note Scales on this side are all red. A [ BI, CI ] D, L Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4071 Frameless Glass Cursor	K&E 4071 c.1915 Frameless glass indicator Made in U.S.A. Front Scale A [ B, C ] D Back Scale: Note Scales on this side are all red. A [ BI, CI ] D, L Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4071-T (Trig) Clamshell Cursor	K&E 4071 (Trig) c.1911 Clamshell style metal framed glass indicator, L scale on edge. Made in U.S.A. Front Scale A [ B, S, C ] D Back Scale: Note Scales on this side are all red. A [ BI, T, CI ] D || L Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4071-T Column Cursor	K&E 4071-T c.1913 Column framed cursor, moved L scale on face Made in U.S.A. Front Scale A [ B, S, C ] D Back Scale: Note Scales on this side are all red. A [ BI, T, CI ] D, L Scan donated by Paul Tarantolo, Houston, Texas.
REF K&E 4071-T All Glass Cursor	K&E 4071-T c.1915 Frameless all-glass cursor, moved L scale on face Made in U.S.A. Front Scale A [ B, S, C ] D Back Scale: Note Scales on this side are all red. A [ BI, T, CI ] D, L Scan donated by Paul Tarantolo, Houston, Texas.
S431 K&E 4071-T	K&E 4071-T Made in U.S.A. Front Scale:  Note: Decimal trig scales (5, 10 divisions/degree) A [ BI, T, CI ] D Back Scale A [ B, S, C ] D Edge Scale: L
S304 K&E 4071-3 DeciTrig	K&E N4071-3 DeciTrig S/N 841357 Made in U.S.A. Front Scale:  Note: Decimal trig scales (5, 10 divisions/degree) K, A [ B, T Cot, ST, S  Cos ] D, DI Back Scale DF [ CF, CIF, CI, C ] D, L
S015 K&E 4080-3 Log Log Duplex Trig	K&E 4080-3 S/N 015307 Made in U.S.A Front Scale: Note: 6,12 div/deg LL0, LL00, A [ B, T, ST, S ] D, DI, K Back Scale L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
ISRM K&E 4080-3 Log Log Duplex Trig	K&E N4080-3 S/N 824568 Made in U.S.A. Patents: Upper stock face RE.20,984;1,930,852;2,168,056;2,170,144;Pat.Pend. Cursor: 2,086,502 Front Scale: Note: 6,12 div/deg LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, K Back Scale L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Original Owner: Francis Paul, Leahy - P.U.
REF K&E 4080-3 Log Log Duplex Trig	K&E N4080-3 S/N 798671 Made in U.S.A. circa 1949-1954 Front Scale: Note: 6,12 div/deg LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, K Back Scale L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Original Owner: John Vincent Atanasoff, (1903-1995) Father of the First Digital Computer. The Atanasoff-Berry Computer was the world's first electronic digital computer which was built by John Vincent Atanasoff and Clifford Berry at Iowa State University during 1937-42. It incorporated several major innovations in computing including the use of binary arithmetic, regenerative memory, parallel processing, and separation of memory and computing functions. On October 19, 1973, US Federal Judge Earl R. Larson signed his decision following a lengthy court trial which declared the ENIAC patent of Mauchly and Eckert invalid and named Atanasoff the inventor of the electronic digital computer - the Atanasoff-Berry Computer or the ABC. This scan of one of his three slide rules at ISRM were provided by the Iowa State University Library, Atanasoff Archives.
ISRM K&E 4080-3 Log Log Duplex Trig	K&E N4080-3 S/N 470704 Made in U.S.A. Front Scale: Note: 6,12 div/deg LL01, K, A [ B, T Cot, ST, S  Cos ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Original Owner: W.R. O'Neill marked on black Cardboard sleeve. On flap: USN V-5 (the United States Navy V-5 preflight program during WWII)
S005 K&E 4081-3 Log Log Duplex Decitrig	K&E 4081-3 S/N 618580 Made in U.S.A. - Notice Black LL0 scales Front Scale: Note: 5,10, 20 div/deg LL00, LL0, A [ B, T Cot, ST, S Cos ] D, DI, K Back Scale L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
ISRM K&E 4081-3 Log Log Duplex Decitrig (1939)	K&E 4081-3 S/N 365785 Made in U.S.A. - Notice RED LL0 scales Front Scale: Note: 5,10, 20 div/deg LL00, LL0, A [ B, T Cot, ST, S  Cos ] D, DI, K Back Scale L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
S536 K&E N4081-3 Log Log Duplex Decitrig	K&E N4081-3 S/N 602728 Made in U.S.A. Front Scale: Note: 5,10, 20 div/deg LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, L1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Mr. Glen Williams was born November 4, 1918 in Adelaide, South Australia. Graduated from University of Detroit, BME, 1952.  Lt in the U.S. Army. Registered Professional Engineer. Board of Governors 1960-61 of Michigan Chapter of American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHVE).  Employed by Carrier Corporation since 1952 in engineering and sales capacities. Died September 13, 2004 in Americus, Georgia. Click for More Pictures
S014 K&E N4081-3 Log Log Duplex Decitrig (1954)	K&E N4081-3 S/N 660187 (1954) Made in U.S.A. Front Scale: Note: 5,10, 20 div/deg LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, L1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
ISRM K&E 4081-3 Log Log Duplex Decitrig (pre1954)	K&E 4081-3 S/N 907527 (pre1954) Made in U.S.A. Patents on lower stock edge: US 2,168,056;2,170,144;2,422,649;2,500,460;2,285,722 Front Scale: Note: 5,10, 20 div/deg LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Note: ST scale changed to SRT in 1955 Original Owner: Edward Lydon, marked on outside of tan sleeve and flap
ISRM K&E 4081-3 Log Log Duplex Decitrig (1955)	K&E 4081-3 S/N 156280 (1955) Made in U.S.A. Front Scale: Note: 5,10, 20 div/deg LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Note: ST scale changed to SRT in 1955 Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
ISRM K&E 4081-3 Log Log Duplex Decitrig (1955-1962)	K&E 4081-3 S/N 2266 (1955-1962) Made in U.S.A. Front Scale: Note: 5,10, 20 div/deg LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Note: ST scale changed to SRT in 1955. Note the SRT stamp on the box label, indicating the change from the ST scale on prior models. The price written on the box was $25.00 (USD). Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ Retail Box End.
REF K&E 4082-3 Log Log Duplex Decitrig With F Scale	K&E 4082-3 Log Log Duplex Decitrig With F Scale Made in U.S.A. - sn 769826 Front Scale: LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, F Back Scale L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Archive - Scan Donated by BajaRon sliderulecentral.com Sleeve with Magnifying Cursor.
S013 K&E 4083-3 Log Log Duplex Vector	K&E 4083-3 S/N 914944 Made in U.S.A. Front Scale: Note: 5,10, 20 div/deg Sh1, Sh2, Th, A [ B, T Cot, ST, S Cos ] D, DI, LL01, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
S252 K&E 4083-3S Log Log Duplex Vector	K&E 4083-3S S/N 131170 Made in U.S.A. Front Scale: Note: 5,10, 20 div/deg Sh1, Sh2, Th, A [ B, T Cot, ST, S Cos ] D, DI, LL01, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Original Owners: W.Dickinson [W1IUW], Jim Gockowski
ISRM K&E N4083-3S Log Log Duplex Vector Vern with a Saturn 1B (1969) and with Mike Konshak(2009) shown donating his personal slide rule to ISRM.	K&E 4083-3 Log Log Duplex Vector S/N 485861 Made in U.S.A. Front Scale: Note: 5,10, 20 div/deg L, LL01, LL1, A [ B, T Cot, ST, S Cos ] D, Th, Sh2, Sh1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Donated by Vernon Estes, Canyon City, Colorado.. Founder of Estes Industries who made the first safe black powder rocket motors in 1958 used by members of the newly formed National Association of Rocketry (NAR) . Vern purchased this slide rule in downtown Denver, Colorado in 1948 when he was in his 3rd year at Westminster Union High School. He used it for advanced math classes in high school, then later at Central College in McPherson, Kansas. He later founded Estes Industries which began his career in model rocketry. He says "my trusty slide rule was an indispensible companion". Based on his own experiences, he offered slide rules (see the Pickett 120) in his sales literature (circa 1964) to help young rocketeers (of which the curator of ISRM was one). Vern engraved his name on the slide rule so it would not get mixed up with his brother Earl Estes' slide rule, who bought his at the same time and later used it in his engineering career at Hughes Aircraft.
P103 K&E 4088-1	K&E 4088-1 S/N 220461 c1924-1935 Made in U.S.A.- All Glass Cursor Front Scale K, A [ B, S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D
REF K&E 4088-2 (Column Cursor)	K&E 4088-2 - patent Dec 22, 1908 Made in U.S.A. Front Scale K, A [ S, T, CI, ] D, L Back Scale DF [CF, CIF, C ] D Scan donated by Clay Castleberry, California
S332 K&E 4088-2	K&E 4088-2 Production #63 1913-1921 Made in U.S.A. - 8" scales - All Glass Cursor Front Scale K, A [ S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D Original Owner: Les Moore, MI - Tool and Die Maker
S310 K&E 4088-2	K&E 4088-2 S/N: none 1913-1921 Made in U.S.A. - 8" scales - All Glass Cursor Front Scale K, A [ S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D Original Owner: H.I.W
S412 K&E 4088-3	K&E 4088-3 Column Cursor c1913-1915 Made in U.S.A. - Column Cursor - No B scale Front Scale K, A [ S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D Original Owner: D.H. Wilson, N 40 Encino, Stanford University, Calif. (on case) Scan donated by Clay Castleberry, California
S451 K&E 4088-3	K&E 4088-3 Production #40 Made in U.S.A. - All Glass Cursor - c1913-1921 Front Scale K, A [ S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D Original Owner: A.R. Hopkins, ONU, EE class of '26,
REF K&E 4088-3	K&E 4088-3 No S/N c1915 (Replacement Cursor c1935) Made in U.S.A. Front Scale K, A [ S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D This slide rule belonged to Linus Carl Pauling [1901-1994], one of the most influential chemists in history as well as one of the most important scientists of the 20th century. One of only 4 individuals ever to have won solo Nobel Prizes in separate and unrelated fields - for chemistry in 1954, and the Nobel Peace Prize for his tireless campaign against atmospheric nuclear bomb testing in 1962. He found this slide rule when he was 17 while still in high school. When the rightful owner was not found, he carried this with him to Oregon State College and used it until he graduated. See his diary page on the left, dated September 23, 1917. The cursor must have been replaced later as that type was not available until 1935. Images courtesy of Oregon State University Library Special Collections
ISRM K&E 4088-3 (1915-1921 with 1936 Cursor)	K&E 4088-3 No S/N c 1915 Replacement Cursor c1936 Made in U.S.A. - Improved Cursor no B scale Front Scale K, A [ S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D Previous Owner: Sheldon Hart
S438 K&E 4088-3 (1922-1934)	K&E 4088-3 S/N 120356 Made in U.S.A. - All Glass Cursor Front Scale K, A [ B, S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D Original Owners - On SR: B.Y.K., Sleeve: A.B.Muller
S488 K&E 4088-3 (1922-1934)	K&E 4088-3 S/N199114 Made in U.S.A. - All Glass Cursor Front Scale- Note: different scale font than previous 4088-3's K, A [ B, S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D Original Owner - On Sleeve: Leown Reynolds, Ohio Northern Univ.
ISRM K&E 4088-3 (1933-1935)	K&E 4088-3 - sn406555 Made in U.S.A. - All Glass Cursor, Flanged Plastic Blocks - 1933-1935 Front Scale (added B scale in 1922) K, A [ B, S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D Original Owner: A.C. Funk
S009 K&E 4088-3	K&E 4088-3 S/N 307077 Made in U.S.A. Front Scale K, A [ B, S, T, CI ] D, L Back Scale DF [ CF, CIF, C ] D
REF K&E 4090 Prototype	K&E 4090 Prototype - 1899 Made in U.S.A. Front Scale: A [ B, C ] D [ C, S ] Back Scale: A [ BI, CI ] D [ CI, L, T ] D Archive - Herman van Herwijnen SRC
REF K&E 4090 Universal	K&E 4090 Universal - 1899 Made in U.S.A. Front Scale: A [ B, C ] D [ C, S ] Back Scale: A [ BI, CI ] D [ CI, L, T ] D Archive - Herman van Herwijnen SRC
REF K&E 4090 Universal (attached slides)	K&E 4090 Universal- 1901/1903 Made in U.S.A. Front Scale: A [ B, C ] D [ C, S ] Back Scale: A [ BI, CI ] D [ CI, L, T ] D Archive - Herman van Herwijnen SRC
S011 K&E 4091-3	K&E 4091-3 S/N 487456 Made in U.S.A. Front Scale LL0, A [ B, K, CI ] T, S2, S1 Back Scale L, LL1, DF [ CF, CIF, CI, , C ] D, LL3, LL2
REF K&E 4092 Column Cursor (1914)	K&E 4092 Column Cursor Made in U.S.A. Patents: June 5, 1900, Dec 22, 1908 Front Scale A [ B, S, C ] D Back Scale LL1, LL2, LL3 [ B, T, CI ] D, L Scan donated by Clay Castleberry, California
REF K&E 4092-3 All Glass Cursor (1916)	K&E 4092-3 Made in U.S.A. - All Glass Cursor (1916) Metal Cursor bars Patents - Upper Stock: Pat. June 5 '00; Dec 22, '08. Cursor: Pat. 8.17.15 Front Scale A [ B, S, T, C ] D Back Scale DF [ CF, CIF, CI, C ] D, L Scan donated by Clark McCoy Collection, California
S426 K&E 4092 Log Log - Lot 4 (UK Model) (1915-1921)	K&E 4092 Log Log - Lot 4 (UK Model) Made in U.S.A. - All Glass Cursor - (1915-1921) Patents - Lower Stock: Pat. June 5 '00; Dec 22, '08. Cursor: Pat. 8.17.15 Front Scale A [ B, S, C ] D Back Scale LL1, LL2, LL3 [ C, T, CI ] D, L Note variance in scales to later US models Original owners Initials: H.V.H., Found in England
S068 K&E 4092-3 (1922)	K&E 4092-3 S/N 5983 Made in U.S.A. - All Glass Cursor (1922) with serial number and "Made In U.S.A." stamp Patents - Upper Stock: Pat. June 5 '00; Dec 22, '08. Cursor: Pat. 8.17.15 Front Scale LL0, A [ B, S, T, C ] LL3, LL2, LL1 Back Scale DF [ CF, CIF, CI, C ] D, L
S038 K&E 4092-3 (1922 w/ 1937 Cursor)	K&E 4092-3 S/N 7102 Made in U.S.A. - Improved 1936 Replacement cursor with serial number and "Made In U.S.A." stamp Patents - Upper Stock: Pat. June 5 '00; Dec 22, '08. Cursor: 2,086,502 (July 6,1937) Front Scale LL0, A [ B, S, T, C ] LL3, LL2, LL1 Back Scale DF [ CF, CIF, CI, C ] D, L
ISRM K&E 4092-3 (1924 w/ 1937 Cursor)	K&E 4092-3 S/N 7102 Made in U.S.A. - Improved 1936 Replacement cursor with serial number and "Made In U.S.A." stamp Patents - Lower Stock: Pat. April 1, '24; Other Pat. Pending; Cursor: 2,086,502 (July 6,1937) Front Scale LL0, A [ B, S, T, C ] LL3, LL2, LL1 Back Scale DF [ CF, CIF, CI, C ] D, L Previous Owner(s): On sleeve: G. Higgings, Ewing.

S535 K&E 4092-3 (1926)

K&E 4092-3 S/N 187247 Made in U.S.A. - All Glass cursor - Used 1926-1930 Patents - Lower Stock: Pat. June 5 '00; Dec 22, '08; April 1, '24; Cursor: Pat. 8.17.15 Front Scale LL0, A [ B, S, T, C ] LL3, LL2, LL1 Back Scale K, DF [ CF, CIF, CI, C ] D, L Parker D. Shepperd (1909-1963) used this slide rule between 1926-1930 at the University of Colorado in Boulder. Graduated 1930 with a mechanical engineering degree. Case has student's address at 1221 University, Boulder, CO, a fraternity house near the campus. Mr Shepperd worked in various firms designing commercial HVAC systems, such as General Electric in Schenectady, NY, and Johnson Service Company in Detroit, Cleveland, and Boston. One of his big projects was the John Hancock Building in Boston. Slide rule donated by his daughter, Marnie, and has now been permanantly transferred, with other items, to the University of Colorado Heritage Center.

ISRM K&E 4092-3 (1924)	K&E 4092-3 S/N 256159 Made in U.S.A. - All Glass Cursor Patents - Lower Stock: Pat. June 5 '00; Dec 22, '08; April 1, '24; Cursor: Pat. 8.17.15 Front Scale LL01, A [ B, S, T, C ] LL3, LL2, LL1 Back Scale K, DF [ CF, CIF, CI, C ] D, L Note: Image used from S007 sn 398625 sent to CHM, which has been replaced. The slide rule is currently in Display case D3 and needs to be scanned.
ISRM K&E 4092-3S (1937)	K&E 4092-3S S/N 526892 Made in U.S.A. - New Improved Cursor (older celluloid compound with KERCS) Patents - Lower Stock: Pat. 1,488,686 (April 1, 1924) - 1.930,852 (Oct 17, 1933); Cursor: 2,086,502 (July 6,1937) Front Scale LL0, A [ B, S, T, C ] LL3, LL2, LL1 Back Scale K, DF [ CF, CIF, CI, C ] D, L Donated by Robert C. Eaton, Boulder, CO.
ISRM K&E 4092-3 (1937)	K&E 4092-3 S/N 515790 (1937) Made in U.S.A. Patents - Lower Stock: Pat. 1,488,686 (April 1, 1924) - 1.930,852 (Oct 17, 1933); Cursor: 2,086,502 (July 6,1937) Front Scale LL0, A [ B, S, T, C ] LL3, LL2, LL1 Back Scale K, DF [ CF, CIF, CI, C ] D, L Previous Owner(s): Names on sleeve: David L. Fort, Russ Hignite, Wm. Hignite
S049 K&E 4093-3	K&E 4093-3 S/N 339210 Made in U.S.A. - all glass Cursor - c1930 Front Scale L, LL0, DF [ CF, B, CI, C ] D, LL3, LL2 Back Scale Sh1, Sh2, Th [ SI1, SI2, TI  TI ] D, S, T
S263 K&E 4093-3	K&E 4093-3 S/N 489831 Made in U.S.A. - Improved Cursor Front Scale L, LL0, DF [ CF, B, CI, C ] D, LL3, LL2 Back Scale Sh1, Sh2, Th [ SI1, SI2, TI  TI ] D, S, T
S043 K&E 4094	K&E 4094 S/N 730837 Made in U.S.A. Front Scale Inch // DF [ CF, CI, C ] D || Cm Back Scale: Blank
REF K&E 4095 Triangular Metal	K&E 4095 Triangular Metal Made in U.S.A. Scale 1: Scale 2: Scale 3: Archive - Herman van Herwijnen SRC
K&E 4095 Merchant Rule	See K&E Specialty Slide Rule gallery
K&E 4096 Merchant Rule	See K&E Specialty Slide Rule gallery
P241 K&E 4097	K&E 4097 S/N 11765 Made in U.S.A. - Note: metal billet cursor spacers Front Scale DF [ CF, CI, C ] D Back Scale 5in [ blank ] 13cm Original Owner: B. B. Haenxl (on case)
P111 K&E 4097-C	K&E 4097-C S/N 40001 Made in U.S.A. - Note: metal billet cursor spacers Front Scale A [ B, CI, C ] D, K Back Scale 5in [ S, L, T ] 13cm
P150 K&E 4097-C	K&E 4097-C sn 53942 Made in U.S.A. - note: Improved framed cursor Front Scale A [ B, CI, C ] D, K Back Scale 5in [ S, L, T ] 13cm
P111 K&E 4097-D	K&E 4097-D sn 85986 Made in U.S.A. Front Scale A, DF [ CF, CI, C ] D, K Back Scale 5in [ S, B, L, T ] 13cm
P222 K&E 4097-D	K&E 4097-D sn 142116 Made in U.S.A. - new Improved cursor Front Scale A, DF [ CF, CI, C ] D, K Back Scale 5in [ S, B, L, T ] 13cm Original Owner: Mrs. D.W. Morris, Dayton, Ohio
P113 K&E 4098A	K&E 4098A S/N 24208 Made in U.S.A. - Celluloid cursor spacers Front Scale: A [ B, C ] D Back Scale: 5in [ S, L, T ] 13cm Back Adv: Fafnir Bearing Original Owner: H.M.Nichols, B,F, Slurturvant Co.
K&E 4100 Stadia Rule	See K&E Specialty Slide Rule gallery
K&E 4108 Military Slide Rule	See K&E Specialty Slide Rule gallery
K&E 4110 Power Trig	See K&E Specialty Slide Rule gallery
K&E 4132 Crane's Sewer Rule	See K&E Specialty Slide Rule gallery
K&E 4133 Roy Lance Electrical	See K&E Specialty Slide Rule gallery
K&E 4135 Engine Power Computing	See K&E Specialty Slide Rule gallery
K&E 4139 Cooke Radio Rule	See K&E Specialty Slide Rule gallery
K&E 4143 Kissam Stadia	See K&E Specialty Slide Rule gallery
K&E 4160 Chemists Rule	See K&E Specialty Slide Rule gallery
P003 K&E 4150-1	K&E 4150-1 S/N 026541 - Simplex Made in U.S.A. Front Scale DF [ CF, CI, C ] D, L Back Adv: 25th Annual Conf. Financial Analysts Federation May, 1972
P110 K&E 4153-1	K&E 4153-1 S/N 009565 - Simplex Made in U.S.A. Front Scale A [ B, CI, C ] D, K Back Slide: [S, L, T] Original Owner: James M. White
P083 K&E 4161-1	K&E 4161-1 S/N 468310 Made in U.S.A. Front Scale K, DF [ CF, L, CI, C ] D, A Back Slide [ T, ST, S, C] Back: blank
S164 K&E 4161-3	K&E 4161-3 S/N 220636 Made in U.S.A.- all plastic stock Front Scale 10inch // K, DF [ CF, L, CI, C ] D, A \\ 25cm Back Slide [ T, ST, S, C] Back: Conversion Factors
K&E 4175 Kurtz Pyschrometric Rule	See K&E Specialty Slide Rule gallery
ISRM K&E 4181-1 Log Log Duplex Decitrig	K&E 4181-1 Log Log Duplex Decitrig S/N 003925 Made in U.S.A. - all plastic stock, all black scales Front Scale (B2.. Artwork) LL01, L, K, A [ B, T, ST, S ] D, DI, LL1 Back Scale (A1.. Artwork) LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Donated by David Hecht Collection, Alexandria, Virginia Green Sleeve
ISRM K&E 4181-1 Log Log Duplex Decitrig	K&E 4181-1 Log Log Duplex Decitrig S/N 133465 Made in U.S.A. - all plastic stock, Red and Black Scales Front Scale (D1::.. Artwork) LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, LL1 Back Scale (C1:::. Artwork) LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Donated by Carlee Heit in memory of her husband, Ray Heit Collection Air Products and Chemicals on Sleeve
ISRM K&E 4181-3 Log Log Duplex Decitrig	K&E 4181-3 Log Log Duplex Decitrig s/n 004408 Made in U.S.A. - all plastic (trade name 'Ivorite') stock, plastic cursor lens. Patents on slide: US 2,168,056;2,170,144;2,285,722 Front Scale (Artwork C:) LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, LL1 Back Scale (Artwork A:::.) LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Note: Green leather sleeve, no markings in Retail box Box end
ISRM K&E 68-1100 Decilon 10	K&E 68-1100 Deci-Lon 10 Made in U.S.A. - S/N 182380 (1962 and later) Front Scale Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K Back Scale Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3 Note: this model was issued to U.S. Air Force Academy Cadets in Colorado Springs, CO. from 1966-1967
ISRM K&E 68-1100 Decilon 10	K&E 68-1100 Deci-Lon 10 Made in U.S.A. - SN 225540 (1971) Front Scale Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K Back Scale Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3 Donated by Jeff Ilseman, Longmont, CO, who was issued this slide rule in 1971 at the U.S. Military Academy at West Point. Jeff graduated with the class of '75, motto Courage and Drive, and has worked a Program Manager in the computer mass storage industry.
REF K&E 68-1100 Decilon 10 Variant	K&E 68-1100 Deci-Lon 10 Variant Made in U.S.A. - S/N 256987 - no ridges on slide Front Scale Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K Back Scale Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3 Archive - Clark McCoy Collection
REF K&E 68-1100 Decilon 10 Late Variant	K&E 68-1100 Deci-Lon 10 Late Variant Made in U.S.A. - S/N 206132 (1972 and later) Front Scale Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K Back Scale Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3 Archive - Ron Knapp Collection
REF K&E 68-1130 Decilon 5	P045 K&E 68-1130 Deci-Lon 5 S/N 027314 c1962-1975 Made in U.S.A. Front Scale Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K Back Scale Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3 Archive - Not in Collection
S483 K&E 68-1210 Log Log Duplex Decitrig	K&E 68-1210 Log Log Duplex Decitrig S/N 310216 c1962-1975 Made in U.S.A.- Note like the early 4081-3 but re-labeled model# Front Scale LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, L1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
S077 K&E 68-1251 Log Log Duplex Decitrig	K&E 68-1251 Log Log Duplex Decitrig S/N 127685 c1962-1975 Made in U.S.A. - Note like the early 4081-3 and later 68-1210  but all-plastic with a thinner stock. Front Scale LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, L1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
ISRM K&E 68-1318 Log Log Duplex Trig (1962-1970)	K&E 68-1318 Log Log Duplex Trig S/N 360416 Made in U.S.A. - Note like the early 4080-3 with degree in minutes and seconds Patents on lower stock: US 2,168,056;2,170,144;2,422,649;2,500,460;2,285,722 Front Scale LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, L1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Note: Tan leather sleeve with belt clip, no markings
K&E 68-1400 Analon 68-1400 Science Analysis	See K&E Specialty Slide Rule gallery
REF K&E 68-1434 Log Log Duplex Vector	K&E 68-1434 S/N 131170 Made in U.S.A. 1962-1975 Front Scale: Note: 5,10, 20 div/deg Sh1, Sh2, Th, A [ B, T Cot, ST, S Cos ] D, DI, LL01, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Original Owner: D.W. Millham Donated by David Hecht, Ney York
S381 K&E 68-1497	K&E 68-1497 Doric S/N 610174 - c1962-1975 Made in U.S.A. Front Scale K, A [ B, T Cot, SRT, S Cos ] D, DI Back Scale DF [ CF, CIF, CI, C ] D, L
P104 K&E 68-1555 Doric	K&E 68-1555 Doric S/N 044486 - c1962-1975 Made in U.S.A. Front Scale K, A [ B, ST, S ] D, T Back Scale DF [ CF, CI, C ] D, L
REF K&E 68-1565 GP12	K&E 68-1565 GP12- Simplex S/N 011932 Made in U.S.A. - 1964 Front Scale Sq1, Sq2, DF [ CF, T Cot,  SRT, S Cos, , CI, C ] D, A, K Back Scale cm (number) [ number, Conversions, logarithm ] inch (logarithm) Donated by David Hecht, Alexandria, VA.
S201 K&E 68-1617	K&E 68-1617 S/N 470490 c1962-1975 Made in U.S.A. Front Scale 10inch // A [ B, CI, C ] D, K \\ 25cm Back Scale: [ T, L, S] Back: Conversion Factors
S504 K&E 68-1775	K&E 68-1775 S/N 860393 c1962-1975 Made in U.S.A. Front Scale 10inch // DF [ CF, CI, C ] D \\ 25cm Back Slide: Blank Back: Conversion Factors
ISRM K&E 68-1892 K12 Prep	K&E 68-1892 K12 Prep c1964-1975 Made in U.S.A. - same as 4058 Front Scale K, A [ B, S, CI T, C ] D, L Back Blank Note: Had a price written on Manual of $3.10 Warning: Do not clean this model using Windex w/Ammonia-D. This is not an engine-divided rule and the ink wipes off.
REF  K&E Doric- Celanese Celcon	K&E Doric- Celanese Celcon S/N 007039 Made in U.S.A.- Green Celcon Plastic Front Scale K, A [ B, ST, S ] D, T Back Scale DF [ CF, CI, C ] D, L Archive - Not in Collection
P004 K&E 9068 Doric	K&E 9068 Doric S/N 8090 Made in U.S.A. Front Scale K, A [ B, ST, S ] D, T Back Scale DF [ CF, CI, C ] D, L
ISRM K&E N9081-3 Doric	K&E N9081-3 Doric S/N 53602 - Duplex Made in U.S.A. Front Scale LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CI, C ] D, LLL3, LL2 Cursor has KERCS, reinforced with paper and epoxy

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