HOME Relay, Ricoh, San-ai group
Includes Exported and Re-Branded U.S. Models

Relay slide rules were manufactured in post-war Japan, originally branded NIKKEI, by Nippon (Japan) Slide Rule Company which was founded c1950. The company then became San-Ai Kekki Ltd. exporting slide rules to the USA as Relay Industrial Company. In April of 1963, the San-ai Group joined with Riken Optical Co. which was founded by Kiyoshi Ichimura in 1938 as Riken Kankoshi Co., Ltd which manufactured sensitized paper. This was later to become Ricoh Ltd, a Japanese conglomerate of companies.


KEEP ISRM FREE!
Ricoh supplied Ricoh brand slide rules to the United States (Ricoh Industries, USA) and to European (Ricoh Europe SA in Switzerland) markets and re-branded slide rules to other companies such as: Alvin, Compass, Dietzgen, Eagle, Engineers, Jason, Lafayette, Lietz, Tobe, Lutz, Fuji, Micronta, Omega, Paleo, Pickett (the B1 only), Relay, Ricoh, Sans & Streiffe, SIC (Scientific Instruments Co), Skyline, SELSI, Staedtler-Mars, J.C.Penny, and Wallace & Wallace.

AA




AA SR815

ISRM 09.01.12.06
AA SR815 dcJK-4 (1961)
Made in Japan by Relay for AA, . Same as Relay 150
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA

Alvin & Company, Inc.

Note: ALVIN rebranded slide rules from the US, Japan and Denmark are all shown in this gallery
On 5/1/1962, a U.S. federal trademark registration was filed for ALVIN. This trademark is owned by Alvin & Company, Inc., Windsor, CT. The USPTO has given the ALVIN trademark serial number of 72143499. ALVIN is an United States importer, manufacturer and distributor of graphic arts, drafting, fine art, office, and craft products. It was founded in 1950 and is still in business.


ALVIN DSR-5 Demonstration Slide Rule

REF

ALVIN DSR-5 Demonstration Slide Rule
Made in USA for/by ALVIN. 1962 Trademark Logo
Front Scale: S, K, A [ B, CI, C ] D, L, T
Back Scale: unknown
Dimensions: 200cm[78.78 in] x 25cm[9.8in]
Note: This is a demonstration or teaching slide rule that was found in a New York City stationary shop.
Archive Photo - Pedlars World, UK


ALVIN 222P X-Act

ISRM 09.01.12.05
ALVIN 222P X-Act
Made by Denmark - Similar to UTO models
Front Scale
5.5in // K, A[ B, CI, C ] D, L
Back Scale: [ S, ST, T ]
Donated by david Hecht, Alexandria, VA


ALVIN 1150 Elite Desi Log (1960)

ISRM 13.12.03.01
ALVIN 1150 Elite Desi Log
Made in Japan by Relay/Ricoh (dc I.K-4) for ALVIN
Dimensions: 35cm x 4.7cm x 0.6cm, 131gm
Material: Plastic laminated bamboo. All plastic cursor, Front Scale: LL0, LL00, A [ B, K, CI, C ] D, S Cos, ST, T Cot
Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Multilined Cursor: Kw, HP, etc.
Original Owner: (Marked in sleeve flap) Lou Lotto, 39 Temple Road, Waltham, Mass. Te: 3-5308
Note that the Model name here is DESI LOG rather than DECI LOG (short for Decimal Log). This was an obvious misspelling by the Japanese firm. Sometime after the first release in 1960, they fixed the problem. The 1969 model below has been corected. Look at this graphic comparing the two slide rules.


ALVIN 1150 Elite Deci Log (1969)

S571
ALVIN 1150 Elite Deci log
Made in Japan by Relay/Ricoh (RS-6) for ALVIN
Dimensions: 35cm x 4.7cm x 0.6cm, 131gm
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, ST, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Multilined Cursor: Kw, HP, etc.


ALVIN 1151 Elite MultiLog

REF
ALVIN 1151 Elite MultiLog
Made in Japan by Relay/Ricoh for ALVIN
Dimensions: 35cm x 4.7cm x 0.6cm, 131gm
Front Scale (Extended)
LL0, L, K, A [ B, S Cos ST ST, T Cot, C ] D, DI, P, LL0
Back Scale (Extended)
LL1, LL2, LL3, DF [CF, CIF, CI, C ] D, LL3, LL2, LL1
Multilined Cursor: Kw, HP, etc.
Note: Same as SIC Relay 151, Lafayette 99-70559 and Sans & Streiffe 312
Scan provided by Rod Lovette Collection, UK


ALVIN 1157 Elite Vector Deci-Trig Log Log

REF
ALVIN 1157 Elite Vector Deci-Trig Log Log
Made in Japan by Relay/Ricoh for ALVIN
Dimensions: 35cm x 4.7cm x 0.6cm, 131gm
Front Scale
Sr, Sθ , P', [Q, CF, CI, C ] D, DF, LL2, LL3
Back Scale (Extended)
Sh2, Sh1. A [ B, K, Th, C ] D, Tr1, Tr2, db
Multilined Cursor: Kw, HP, etc.
Note: Similiar to SIC Relay 1570
Scan provided by Steve Seale Collection, Nashville, Tennessee.

Compass Instrument and Optical Company

Compass was located at 268 Fourth Ave. New York 10, New York
They rebranded slide rules from the US as well as Japan. The first few shown in this gallery were made in the U.S.A. After WWII Compass started rebranding the Ricoh line of slide rules.


Compass 4" dia Midget (Gilson) Circular
ISRM 10.09.14.02
Compass Midget (Gilson - 1931, 1936 Copyrights) - 10.2cm dia
Made in USA for Compass by Gilson Slide Rule Co., Stuart, Florida
Front Scales
C,CI,A,K,Log,LL1,LL2,LL3,LL4,
Back Scales
Binary, Fraction,Drill,Thread, Millimeter
Donated by David Viscusi, Carlsbad, California
David bought this slide rule when he was a Drafting apprentice at General Electric, Schenectady NY (1971). Already well used, it was purchased for $5 from a retiring engineer that helped design Large Steam Turbine Generators. It helped get him through his BSME night courses. David is now the Engineering & Technical Services Supervisor at Gemological Institute of America (GIA)

Compass 8" Binary (Gilson) Circular

ISRM 17.08.24.01
Compass 8" Binary Circular (Gilson - 1931, 1936 Copyrights) - 21.4cm dia
Made in USA for Compass by Gilson Slide Rule Co., Stuart, Florida
Front Scales
C,CI,A,K,Log,LL1,LL2,LL3,LL4,
Back Scales
Binary, Fraction,Drill,Thread, Millimeter


Charvoz-Roos SR-108 Dual Duplex
ISRM 17.08.24.04
Charvoz-Roos SR-108 Dual Duplex (Metal Braces)- c1946
Made in USA
Note: Scales set up as if it's a 10inch scale
Front Scale
K, A [ B, S, T, C ] D, DI
Back Scale
Fraction-Decimal[ L, C2, C1 ] D1, D2, D
Manual 7.56Mb


REF Compass 403 (c1962)
Compass 403
Made in Japan by Relay/Ricoh
Front Scale
10cm // A [ B, CI, C ] D || 5in
Back scale: [S, L, T ]
Back: Calculating Guide formulas
Scan provided by Cassou Olivier Collection


Compass 505 (1962)

ISRM 09.01.12.04
Compass 505 (Date Code K.K-4)
Made in Japan by Relay/Ricoh
Front Scale
13cm // A [ B, CI, C ] D, K || 5in
Back scale: [S, L, T ]
Back: Calculating Guide formulas
Donated by David Hecht, Alexandria, Virginia


Compass 1018


ISRM 09.01.12.03
Compass 1018
Made in USA - NY - by Bruning
Front Scale
12.5cm // A [ B, CI, C ] D, K \\ 5in
Back Scale: [S, L, T ]
Back: Blank
Originally Owned by W. Hatch (marking on sleeve)
Donated by David Hecht, Alexandria, Virginia


Compass 1315 (1967)

ISRM 13.05.19.02
Compass 1315 dc P.S-3 (1967)
Made in Japan by Relay/Ricoh
Front Scale
A [ B, CI, C ] D, K
Back Scale: [S, L, T ]
Back: Equivalents
Donated by Jeremiah Whitney, Louisville, Colorado
Jeremiah Wadsworth Whitney (1941- ) used this slide rule in his career as an Architect.He graduated with a B.Arch degree from Yale University in 1963, and as part of the Officer Candidate School, he spent the next 5 years (1963-1968) as a commissioned officer, in the U.S. Naval Reserves, achieving the rank of Lieutenant, He received his MS.Architecture from Yale in 1971, then relocated to Colorado and specialized in residential design for developers. Photo taken by ISRM in 2013.


S231 Compass 1321 Log Log
Compass 1321 Log Log
Made in Japan (FK1) for Compass Instruments
Front Scale
LL0, LL00, A [ B, K, CI C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2


Compass 1321 Log Log

ISRM 09.01.12.02
Compass 1321 Log Log
Made in Japan (PS-4) for Compass Instruments
Front Scale
LL0, LL00, A [ B, K, CI C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA

Engineers



Engineers No.1050
ISRM 09.01.12.07
Engineers No.1050 dc KK-4 (1960)
Made in Japan by Relay
Front Scale
25cm // K, A, [ B, CI, C ] D, L || 10in
Back Scale
Equivalents [ S, S&T, T ]
Donated by David Hecht, Alexandria, VA


Engineers No.1500 Duplex Decitrig Log/Log

ISRM 09.01.12.08
Engineers No.1500 Duplex Decitrig Log/Log dcLS-4 (1963)
Made in Japan by Relay, 21 scales, same a Relay 150
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, S T, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


P099 Engineers No.5500
Engineers No.5500 - Open Duplex
Made in Japan - code KK-4
Front Scale
A, [ B, S, T, C ] D, K
Back Scale
DF [ CF, CI, C ] D, L

Jason



S472 Jason 800
Jason 800
Made in Japan for Jason by Relay/Ricoh
Front Scale
A [ B, CI, C ] D, K
Back Scale
[ S, L, T ]
Back: Equivalents




Jason 802 Decitrig Log/Log

ISRM 09.01.12.09
Jason 802 Decitrig Log/Log dcLS-4 (1963)
Made in Japan by Relay,, 21 scales
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, S T, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


Jason 803 Log Log Duplex Deci-Trig (1965)

ISRM 14.02.13.01
Jason 803 Log Log Duplex Deci-Trig
Made in Japan by Relay/Ricoh 28 scales - Date Code N.S-3
Front Scale (extended)
LL/0, L, K, A [ B, S Cos, ST Cos, T Cot, C ] D, DI, P, LL0
Back Scale (extended)
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Original owner(Written inside flap of sleeve): Brian Keith, 316 Alumni, P.O. Box 1823
Note: Cursor bars were yellowed and replaced with whiter ones from a SIC cursor


Lafayette Radio Corp.; New York, N.Y., 100 Sixth Avenue (Syosset)

1960 Catalog, Slide Rule Page
Founded 1920 as Wholesale Radio Service Co. Inc. Trade names LaFayette, Trutest.The company sold radio sets, amateur radio equipment, citizen's band (CB) radios, and other communications equipment, as well as electronic components and even tools, through retail outlets as well as by mail-order.


Lafayette F341 Duplex Log Log Decitrig

ISRM 09.01.12.10
Lafayette F341 Duplex Log Log Decitrig
Made in Japan by Relay/Ricoh 21 scales (same as Ricoh 150)
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, S T, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original owner, marked on SR: T. Zidank Dept 72
Donated by David Hecht, Alexandria, VA


Lafayette F341 Duplex Log Log Trig

ISRM 10.09.14.01
Lafayette F341 Duplex Log Log Trig
Made in Japan by Relay/Ricoh - date code I.K-3 (1960)
Front Scale (Trig scales:Deg-Min-Sec)
LL0, LL00, A [ B, K, CI, C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original owner, marked on case: Wayne Evans
Donated by Ed Millis,Dallas, TX
Note: A very astute collector had found this F341 and wrote ISRM saying that the description was wrong because the trig scales were in degree, minutes and seconds, rather than decimal degrees found on decitrig models. See the Lafayette F341 above. As it turns out we were both correct and Lafayette (or Ricoh) changed the scales set and kept the model number. Ed donated it to ISRM for others to enjoy.


S025 Lafayette F-381
Lafayette F-381 - Closed simplex
OEM Japan for U.S. company Radio Shack
Front Scale
A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]
Back: Conversion Chart


C32 Lafayette F-382 (Concise 270)
Lafayette F-382 (Concise 270)
Made in Japan by Concise - 11.2cm Dia
Front Scale
L, D ( C, CI, A, K )
Back Scale
DI, D ( S, T1, T2, ST )


REF Lafayette F-428 Log Log Duplex Deci-Trig
Lafayette F-428 Log Log Duplex Deci-Trig
Made in Japan by Relay/Ricoh 25 scales - dc I.S-4 (1960)
Front Scale (extended)
LL/0, L, K, A [ B, S, ST, T, C ] D, DI, P, LL0
Back Scale (extended)
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Scan provided by Mark Armbrust, Boulder, Colorado website:marksmath.com


P162 Lafayette F-681 Decilog
Lafayette F-681 Duplex Decilog  dc J.K-1 1961
OEM Japan Ricoh  for U.S. Company Lafayette - 24 scales
Front Scale
LL-0, L, K, A [ B, S, T, C ] D, DI, P, LL0
Back Scale
LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1


Lafayette F-686 Vector log

ISRM 13.10.08.01


Leather Sleeve and Instructions 396KB PDF
Lafayette F-686 Vector log Date code J.K-1
OEM Japan Relay/Ricoh for U.S. Company Lafayette - 26 scales
Front Scale
Tr1. Tr2, P', P L, K, A [ B, S Cos, ST Sr, Se, C ] D, LL03, LL02, LL01
Back Scale
Sh1, Sh2, DF, A [ B, CF,CF, Th CI, C, LL1' ] D, LL3, LL2, db
Note the short, unique LL1' scale which was developed in the Lafayette laboratory to provide more accuracy when calculating logeN and ex when x is close to 1.
Gift of Marion Moon, of Orange, California.
Marion is a member of the Oughtred Society. Retired Software/Systems Engineer at Hughes Aircraft Co. BSEE University of Kanasas. Collects End-of-Era Slide rules from worldwide manufactures. Marion is a generous financial contribiutor and donor of slide rules and scans to the ISRM galleries and a supporter the educational inititives.


P220 Lafayette 99-7030
Lafayette 99-7030
OEM Japan Relay/Ricoh  for U.S. Company Lafayette - 9 scales
Front Scale
13cm // A [ B, CI, C ] D, K || 5in
Back Scale: [ S, L, T ]
Back: Quick Computing aids


Lafayette 99-70302 (1972)

ISRM 09.01.12.11
Lafayette 99-70302 (Date Code US-3)
Made in Japan by Relay/Ricoh (same as Ricoh 505)
Front Scale
13cm // A [ B, CI, C ] D, K || 5in
Back scale: [S, L, T ]
Back: Calculating Guide formulas
Donated by David Hecht, Alexandria, Virginia


Lafayette 99-7031 Duplex Decitrig Log/Log (1965)

ISRM 09.01.12.12
Lafayette 99-7031 Duplex Decitrig Log/Log dcNS-2
Made in Japan by Relay/Ricoh , 21 scales
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, S T, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


Lafayette 99-70310 Duplex Decitrig Log/Log (1965)

ISRM 09.01.12.13
Lafayette 99-70310 Duplex Decitrig Log/Log dcNS-2
Made in Japan by Relay/Ricoh , 21 scales
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, S T, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


P179 Lafayette 99-7099 Decimalog
Lafayette 99-7099 Decima-log 1961
OEM Japan Relay/Ricoh  for U.S. Company Lafayette - 24 scales
Front Scale
LL-0, L, K, A [ B, S, T, C ] D, DI, P, LL0
Back Scale
LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1


P180 Lafayette 99-7099 Decima-log
Lafayette 99-7099 Decima-log 1961
OEM Japan Relay/Ricoh  for U.S. Company Lafayette - 24 scales
Front Scale
LL/0, L, K, A [ B, S, T, C ] D, DI, P, LL0
Back Scale
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1


ISRM Lafayette 99-70559 Decima-log (1968)
Lafayette 99-70559 Decima-log - date code Q.S-3
OEM Japan Relay/Ricoh (QS-3) for U.S. Company Lafayette - 28 scales
Front Scale (extended)
LL/0, L, K, A [ B, S Cos, ST ST, T Cot, C ] D, DI, P, LL0
Back Scale (extended)
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Donated by Russell Fox, Anchorage, Alaska.
This slide rule was used by his father. He worked as an Electrical Engineer with BPA in Portland, Oregon. BPA and ASEA had a joint venture in providing electrical energy.


REF Lafayette 99-7102 Vector log
Lafayette 99-7102 Vector Log (Same as F-686)
OEM Japan Relay/Ricoh for U.S. Company Lafayette - 27 scales
Front Scale
Tr1. Tr2, P', P L, K, A [ B, S Cos, ST Sr, Se, C ] D, LL03, LL02, LL01
Back Scale
Sh1, Sh2, DF, A [ B, CF,CF, Th CI, C, LL1' ] D, LL3, LL2, db,
Archive - Tom Dilatush Collection
Note the short, unique LL1' scale which was developed in the Lafayette laboratory to provide more accuracy when calculating logeN and ex when x is close to 1.
Instructions 396KB PDF


REF Lafayette 99-71029 Vector log (1961)
Lafayette 99-71029 Vector log - Date Code J.K-1
OEM Japan Relay/Ricoh for U.S. Company Lafayette - 26 scales
Front Scale
Tr1. Tr2, P', P [ Q, ST Sr, Se, C ] D, LL03, LL02, LL01
Back Scale
Sh1, Sh2, DF, A [ B, CF, Th CI, C ] D, LL3, LL2, db,
Archive - Scan courtesy of Rod Lovette Collection (UK)
Note the short, unique LL1' scale on the C scale which was developed in the Lafayette laboratory to provide more accuracy when calculating logeN and ex when x is close to 1.


Lafayette 99-7128 Decima-Dyne

ISRM 14.09.21.01
Lafayette 99-7128 Decimadyne
OEM Japan Relay/Ricoh for U.S. Company Lafayette - 24 scales
Front Scale
db -20-0 +0-20, DF [ CF, CIF, CI, C ] D, A
Back Scale
XC, XL, K [K1, S, T ] F2, F1, DI,
Gift Of Edward T. Wright, Odenton, Maryland.

Decima-Dyne Instructions (10.7MB) and Leather Sleeve

Lutz

The actual owners of the U.S. brand of Slide Rules Lutz are unknown (at this time). They were part of many entrepineurs that began distributing re-branded Ricoh slide slide rules after WWII.


S188 Lutz 102SC
Lutz 102SC - Duplex
Made in Japan
Front Scale
S, K, A [ B, CI, C ] D, L, T
Back: Blank

Lutz 151 Multilog
Need a specimen or scan of this model.
Lutz 151 Multilog
Made in Japan by Relay/Ricoh
Dimensions: 35cm x 4.7cm x 0.6cm, 131gm
Front Scale (Extended)
LL0, L, K, A [ B, S Cos ST ST, T Cot, C ] D, DI, P, LL0
Back Scale (Extended)
LL1, LL2, LL3, DF [CF, CIF, CI, C ] D, LL3, LL2, LL1
Multilined Cursor: Kw, HP, etc.
Note: Same as SIC 151, ALVIN 1151, Lafayette 99-70559 and Sans & Streiffe 312

Lutz 153 Trig
Need a specimen or scan of this model.
Lutz 153 Trig
Made in Japan by Relay/Ricoh
Front Scale
K, A [ B, S, ST, T C ] D, DI
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2


Lutz 252 U.S. dcMS-4 (1964)

ISRM 12.05.06.01

Expanded Family Biography of Wallace and Ruth Kane and daughter Ann Kilby (7.09MB)
See other slide rules from this talented family in the K&E, Post and Pickett Galleries.
Lutz 252 U.S. dcMS-4 (1964)
Made in Japan - Marked as U.S. (note red Cos, T, and Cot scales)
Front Scale
K, A [ B, T1 Cot1, T2 Cot2, ST ST, S Cos, ] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L
Owned by Ruth Moira (Kilby) Kane (1921-2007). Donated in her memory by her daughter Anne Kilby, Kingston, Washington

Ruth Moira Kane (1950) with daughter Anne Kilby

Ruth was born in Seattle Washington, a child of academic tutors. The family moved to be part of the University of Denver. She acquired her first slide rule in high school and used it in physics while working as an assistant to Dr. Recht on the DU observatory. She went to UC Berkely, received her Masters and worked on her PhD. She was hired to work at the defense Laboratory at Livermore where she met her second husband, Wallace E. Kane (see the K&E gallery for his slide rule). After 1971 she did scientific editing and translated German articles. The couple relocated to the Puget Sound area in 1973 and Ruth became a public organizer to protect the local forests from over-development. She was an active musician, like her husband.


Lutz 252 U.S. Government (1963)

ISRM 12.06.04.06
Lutz 252 U.S. Government date code L.S.-1 (1963)
Made in Japan - Marked as U.S. Government
Front Scale
K, A [ B, T1, T2, ST, S] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L
Donated by Stephanie H., Phoenix, Arizona - representing the Huang Collection, San Diego, California
The collector, who prefers to remain anonymous, obtained a B.S. degree in Physics from Taiwan's National Tsing Hua University in 1971. His love for computation has encouraged him to build a collection of slide rules, HP and TI calculators, as well as abaci, many displayed at ISRM.


Lutz 252 U.S.

ISRM 09.01.12.14
Lutz 252 U.S.
Made in Japan - Marked as U.S. (note red Cos, T, and Cot scales)
Front Scale
K, A [ B, T1 Cot1, , T2 Cot2, ST ST, , S Cos, ] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L
Donated by David Hecht, Alexandria, VA


Lutz 300B U.S.

REF
Lutz 300B U.S.
Made in Japan - Marked as U.S.
Front Scale
Sh1, Sh2, Th, A [ B, T Cot, ST ST, S Cos, C ] D, DI, P, K
Back Scale
LL1,LL2, LL3, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Scan provided by the Steve Seale Collection, Nashville, Tennessee

Lutz 551 Duplex Log/Log
Need a specimen or scan of this model.
Lutz 551 Duplex Log/Log
Made in Japan - 24 scales
Front Scale
LL-0, L, K, A [ B, T, S, C ] D, DI, P, LL0
Back Scale
LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1

Micronta




Micronta (Nestler) 14/52

ISRM 09.01.12.15
Micronta (Nestler) 14/52
Made in Germany by Nestler for US Brand Micronta
Note: All other Microntas were made by Ricoh
Front Scale
10.5in // A [ B, C ] D
Back Scale
[ S, lg, T ]
Multilined cursor
Back: Equivalents (in English)
Donated by David Hecht, Alexandria, Virginia


S306 Micronta 150 Duplex Decitrig Log/Log
Micronta 150 Duplex Decitrig Log/Log
Made in Japan by Relay/Ricoh J.K-3- 21 scales dc J.K-3 (1961)
Front Scale (Trig scales:Deg-Min-Sec)
LL0, LL00, A [ B, K, CI, C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2


Micronta 157 Electrical Duplex Vectorlog (1961)

ISRM 09.01.12.16
Micronta 157 Electrical Duplex Vectorlogdc dcJ.K-4
Made in Japan by Keikico San-ai (Ricoh) (1961)
Front Scale
Sr, SΘ, P', P [ Q, CF, CI, C ] D, DF, LL2, LL3
Back Scale
Sh2, Sh1, A [ B, K, Th, C ] D, Tr1, Tr2, db
Donated by David Hecht, Alexandria, VA


Compass 505 (1959)

ISRM 09.01.12.17
Compass 505 (Date Code H.K-2)
Made in Japan by Relay/Ricoh
Front Scale
13cm // A [ B, CI, C ] D, K || 5in
Back scale: [S, L, T ]
Back: Calculating Guide formulas
Donated by David Hecht, Alexandria, Virginia


P054 Micronta 551 Duplex Log/Log
Micronta 551 Duplex Log/Log
Made in Japan - 24 scales
Front Scale
LL-0, L, K, A [ B, T, S, C ] D, DI, P, LL0
Back Scale
LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1

Nikkei




REF Nikkei No 150
Nikkei No 150
Made in Japan by Relay - Nikkei was the parent Company
Front Scale
LL/1, LL/2, LL/3, A [ B, T Cot, S Cos, ST Cos, K, CI, C ] D, S, ST, T
Back Scale
L, K, DF [ CF, CIF, CI, C ] D, LL0, LL/0
Scan provided by Cory Fletcher

Olson




S380 Olson TL-373 (Relay 150)
Olson TL-373 (Relay 150)
Made in Japan by Relay for Olson (electronic supply), Akron, Ohio.
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2


Olson TL-373 (Relay 150)

ISRM 09.01.12.18
Olson TL-373 (Relay 150) dc JK-4 (1961)
Made in Japan by Relay for Olson (electronic supply), Akron, Ohio.
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


Olson TL-472 Electrical
Olson TL-472 Electrical dc N.S-3 (1965 Shizuoka Factory)
Made in Japan by Relay/Ricoh for Olson (electronic supply), Akron, Ohio.
Front Scale
25cm // E, Dynamo/motor, Volt, V, A(kw) [ B(hp), K, CI, C ] D, S, T || 10 in
Back Scale
[ LL3, LL2, LL1, L ]
Instructions 4.3MB PDF

Omega




S019 Omega DT-1015
Omega DT-1015 Duplex
Made in Japan by Relay/Ricoh for Omega
Front Scale
K, A [ B, S, ST, T, C ] D, D1
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL2, LL3




REF - Pickett B-1
Pickett B-1 - Duplex - ca.1950
Made in Japan by Ricoh - The only Laminated Bamboo Pickett model 
Front Scale
LL0, L, A [ B, Cos S, SecT ST, T T, C ] D, sqr1, sqr2, LL0
Back - Slider
LL1, LL2, LL3, DF [ CF, CIF, CI, C] D, LL3, LL2, LL1
Archive

Relay




Early Post WWII Japanese Pocket Mannhiem Ricoh
ISRM 17.06.17.03
Early Post WWII Japanese Pocket Mannhiem Ricoh
Made in Japan by Ricoh. Note: cursor is same as other Relay/Ricoh models
Note: Take a close look of the front scale labels. They are irregular like they were hand etched
Front Scale
?// A, [ B, CI(faded off), C ] D || ?
Back Slider
[ S, L, T] Faded off
Back: Note: the cutouts for the trig scales. One side is different than all other Ricoh models.
Gift Of Phillip Rodley, UpperHutt, New Zealand


REF Relay 5 inch
Relay 5 inch - Closed simplex
Made in Japan
Front Scale
A [ B, C ] D, K
Back: Blank


S026 Relay 82
Relay 82 - Closed simplex
Made in Japan
Front Scale
A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]
Back: Blank


S027 Relay 83
Relay 83 - Closed simplex
Made in Japan
Front Scale
K, DF [ CF, CI, C ] D, A
Back Slider
[ S, L, T ]
Back: blank


S171 Relay 102
Relay 102 - Closed simplex
Made in Japan by Keikico
Front Scale
A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]
Back: Conversion Chart


Relay 102 (1960)

ISRM 14.01.10.79
Relay 102 I.K-2
Made in Japan by Keikico
Front Scale
A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]
Back: Conversion Chart (not present on this specimen). See example below.


REF Ricoh 107 Electro
Ricoh 107 Electro - Closed simplex
Made in Japan by Ricoh, dc G.K-2 (1958)
Front Scale
25cm // Dynamo, MotorLL1, A(KW) [ B(HP), CI, C ] D, LL2, Volt || 10in
Back Scale
Equivalents [ S, L, T ]
Scan by Olivier Cassou, France


Relay 150 Log-Log Decitrig (1951)

ISRM 09.01.12.19
Relay 150 Log-Log Decitrig dcB.K-4
Made in Japan by Relay (1951)
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


Relay 153 Decitrig (1957)

ISRM 09.01.12.20
Relay 153 Decitrig dc HS-2
Made in Japan by Relay for S.I.C. (Scientific Intruments Inc) in Berkely, CA
Front Scale
K, A [ B, S, ST, T C ] D, DI
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


REF Relay 157 (Electrical)
Relay 157 - (Electrical) Duplex
Made in Japan by Keikico (Ricoh)
Front Scale
Sr, SΘ, P', P [ Q, CF, CI, C ] D, DF, LL2, LL3
Back Scale
Sh2, Sh1, A [ B, K, Th, C ] D, Tr1, Tr2, db
Archive - Atsushi Tomozawa collection (Japan)


REF Relay 158 (Electrical)
Relay 158 - (Electrical) Duplex
Made in Japan by Keikico (Ricoh)
Front Scale
Sh2, Sh1, Th, A [ BI, S, T, CI, C ] D, LL3, LL2, LL1
Back Scale
X2, X1, P2, P1 [ Q, Y, L, LX, I ] I, LΘ1, LΘ2, LY
Archive - Atsushi Tomozawa collection (Japan)


Relay 252 Trig

ISRM 11.11.10.03
Relay 252 Trig dc K.K-4 (1962)
Made in Japan by Ricoh
Front Scale
K, A [ B, T1, T2, ST, S] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L


Relay 403 4inch Pocket Slide Rule 1955
ISRM 14.07.22.07
Relay 403 4inch Pocket Slide Rule - dc D.K-3
Made in Japan by Ricoh
Front Scale
4in // A, [ B, CI, C ] D || 10cm
Back Slider
[ S, L, T]
Back: Conversion Chart
Gift Of Phillip Rodley, UpperHutt, New Zealand


P134 Relay T-501
Relay T-501 - Closed simplex
Made in Japan
Front Scale
13cm // A, [ B, CI, C ] D, K || 5in
Back Slider
[ S1, L, T1 ]
Back: Conversion Chart


P135 Relay 505
Relay 505 - Closed simplex
Made in Japan
Front Scale
13cm // A [ B, CI, C ] D, K || 5in
Back Slider
[ S, L, T ]
Back: Conversion Chart


REF Relay B-506
Relay B-506 - Closed simplex
Made in Japan
Front Scale
13cm // DF [ CF, CI, C ] D, A || 5in
Back Slider
[ S1, L, T1 ]
Back: Conversion Chart
Scan by Olivier Cassou, France


Relay 550 (1951)

ISRM 09.01.12.21
Relay 550 dcBS-2 - Open Duplex
Made in Japan by Relay (1951)
Front Scale
A [ B, S1, T1, C ] D, L
Back Scale
DF [ CF, CI, C ] D, K
Donated by David Hecht, Alexandria, VA


Relay 602 (c1952)

ISRM 09.01.12.22
Lafayette_99-7032 (No Date Code)
Made in Japan by Relay/Ricoh (6 inch)
Front Scale
15cm // K, A [ B, CI, C ] D, L || 6in
Back scale: [S, L, T ]
Back: Calculating Guide formulas
Donated by David Hecht, Alexandria, Virginia


REF Relay 605 Electro
Relay 605 Electro
Made in Japan
Front Scale
15cm // Dynamo-Mot, L1, A [ B, CI, C ] D, L2, Volts || 6in
Back Scale: [ S, L, T ]
Back: Equivalents Table
Archive - Atsushi Tomozawa collection (Japan)


Relay DE-1008

REF
Relay DE-1008
Made in Japan by Relay/Ricoh
Front Scale
Sh2, Sh1, Th, A [ BI, S, T, CI,C ] D, LL3, LL2, LL1
Back Scale
LL0, L, K, A [ B, S, ST, T, C ] D, DI, P, LL0
Scan provided by the Steve Seale Collection, Nashville, Tennessee


Relay DT-1015 Trig

ISRM 09.01.12.23
Relay DT-1015 Trig
Made in Japan by Relaybr> Front Scale
K, A [ B, S, ST, T C ] D, DI
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


Relay DT-1065

REF
Relay DT-1065
Made in Japan by Relay/Ricoh
Front Scale
LL1,LL2, LL3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back Scale
LL0, L, K, A [ B, S, ST, T, C ] D, DI, P, LL0
Scan provided by the Steve Seale Collection, Nashville, Tennessee


Relay T-1031 (1960)

ISRM 09.01.12.24
Relay T-1031 dcKK-4
Made in Japan by Relay - dcKK-4 (1960)
Front Scale
25cm // K, A, [ B, CI, C ] D, L || 10in
Back Scale
Equivalents [ T2, T1, ST, S ]
Note: metal bridge (spring) on back is very corroded
Donated by David Hecht, Alexandria, VA

Ricoh




Ricoh 82 (8 inch version of 102) (1972)

ISRM 09.01.12.25
Ricoh 82 - Closed simplex dc US-5
Made in Japan by Ricoh, dc US-5 (1972)
Front Scale
A [ B, CI, C ] D, K
Back Slider
Equivalents [ S, L, T ]
Donated by David Hecht, Alexandria, VA


Ricoh 102 (10 inch version of 82)(1972)

ISRM 09.01.12.26
Ricoh 102 - Closed simplex dc US-5
Made in Japan by Ricoh,
Front Scale
A [ B, CI, C ] D, K
Back Slider
Equivalents [ S, L, T ]
Donated by David Hecht, Alexandria, VA


S091 Ricoh 107 Electro
Ricoh 107 Electro - Closed simplex
Made in Japan
Front Scale
E (Dynamo), V (volt), A (amp)[ B, K, CI, C ] D, S, T
Back Slider
[ LL3, LL2, LL1, L]
Back: Conversion Chart


REF Ricoh 116
Ricoh 116 - Closed simplex
Made in Japan by Ricoh
Front Scale
25cm // K, DF [ CF, CIF, CI, C ] D, A, DI || 10in
Back Scale
Equivalents [ T1, T2, L, S ]
Scan by Olivier Cassou, France


REF Ricoh 121 Log-Log
Ricoh 121 Log-Log - Closed simplex
Made in Japan by Ricoh
Front Scale
10in // S, T, A [ B, K, CI, C ] D, P || 25cm
Back Scale
Equivalents [ L, LL1, LL2, LL3 ]
Scan by Olivier Cassou, France


S333 Ricoh 150 Duplex Decitrig Log/Log (1969)
Ricoh 150 Duplex Decitrig Log/Log
Made in Japan by Relay/Ricoh, date code RS-3, 21 scales
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, S T, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2


Ricoh 151 MultiLog (1969)

REF
Ricoh 151 MultiLog
Made in Japan by Relay/Ricoh - date code dcR.S-6
Dimensions: 35cm x 4.7cm x 0.6cm, 131gm
Front Scale (Extended)
LL0, L, K, A [ B, S Cos ST ST, T Cot, C ] D, DI, P, LL0
Back Scale (Extended)
LL1, LL2, LL3, DF [CF, CIF, CI, C ] D, LL3, LL2, LL1
Multilined Cursor: Kw, HP, etc.
Note: Same as SIC 151, ALVIN 1151, Lafayette 99-70559 and Sans & Streiffe 312
Scan provided by the Steve Seale Collection, Nashville, Tennessee


Ricoh 153 Trig (1961)

ISRM 09.01.12.27
Ricoh 153 Trig dc LS-2
Made in Japan by Ricoh
Front Scale
K, A [ B, S, ST, T C ] D, DI
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA


Ricoh 252 (1963)

ISRM 09.01.12.28
Ricoh 252 dcLS-4
Made in Japan by Ricoh
Front Scale
K, A [ B, T1 Cot1, , T2 Cot2, ST ST, , S Cos, ] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L
Donated by David Hecht, Alexandria, VA


P082 Ricoh 403 4inch
Ricoh 403 - Closed simplex
Made in Japan - in Retail Box
Front Scale
10cm // A, [ B, CI, C ] D || 4in
Back Slider
[ S, L, T]
Back: Conversion Chart


P105 Ricoh 550
Ricoh 550 - Open Duplex
Made in Japan by Relay - code NK-2
Front Scale
A, [ B, S, T, C ] D, K
Back Scale
DF [ CF, CI, C ] D, L

Sans & Streiffe



S245 Sans & Streiffe_310
Sans & Streiffe 310
Made in Japan by Relay dc G.K-3 (1958) for Sans & Streiffe
Front Scale (extended)
25cm // K, A [ B, CI, C ] D, L || 10inch
Back Scale
[ S, S&T, T ]



Sans & Streiffe No. 311 Log Log

ISRM 17.08.24.02
Sans & Streiffe No. 311 Log Log (version 1)
Made in Japan by Relay dc I.S-2 (1960) for Sans & Streiffe
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, ST, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original owner (Name marked inside flap): W.C. Franz K9KYF of Glenn Ellyn, Illinois
Gift Of Nancy Morris ot Tempe, Arizona. Dustin E. Morris Collection


Sans & Streiffe No. 311 Log Log

ISRM 12.09.25.02
Sans & Streiffe No. 311 Log Log (version 2)
Made in Japan by Relay dc P.S-2 (1967) for Sans & Streiffe
Front Scale
LL0, LL00, A [ B, K, CI, C ] D, S Cos, ST, T Cot
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original owner (Name marked inside flap and initials on stock): H. Mayer


S320 Sans & Streiffe 312
Sans & Streiffe 312
Made in Japan by Relay dc J.S-3 (1961) for Sans & Streiffe
Front Scale
LL0, L, A [ B, S, ST, T, C ] D, DI, P, LL0
Back Scale
LL1, LL2, LL3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1

S.I.C.
These Ricoh manufactured Slide Rules have a large number of models so they have their own Sci.Inst.Co. SIC gallery


SKYLINE Distributors Denver, Colorado

Skyline Distributors was a Denver based company that specialized in electronics supply much like Radio Shack or Lafayette Electronics.
They ended their business in 1993 and the trademark name taken up by other companies.


Skyline Technolog 151

ISRM 06.12.20.01
Skyline Technolog 151
Made in Japan by Relay for Skyline Distributors dc P.S-4 (1967)
Front Scale (extended)
LL-0, L, K, A [ B, S Cos, ST ST, T COT, D ] D, DI, P, LL0
Back Scale (extended)
LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Donated by Bill Boas, Lakewood, CO.
Purchased in 1993 directly from the Skyline store in Denver before they ended the business


Staedtler Mars

This slide rule was manufactured by Ricoh as an OEM and rebranded for the German market. It is listed here for reference and also appears in the Germany/Staedtler gallery.


Staedtler Mars 944-24 (1969)

REF
Staedtler Mars 944-24 - date code T.S.6
Made in Japan by Relay/Ricoh
Front Scale
LL0, L, K, A [ B, S Cos, ST ST, T Cot, C ] D, DI, P, LL0
Back Scale
LL1,LL2, LL3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Scan provided by the Steve Seale Collection, Nashville, Tennessee

Zodiak Instrument Sales, CA




Zodiak No 150 Duplex Log Log Trig (1955)

ISRM 09.01.12.29
Zodiak No 150 Duplex Log Log Trig dc DK-4
Made in Japan by Relay for Zodiak Instrument Sales,CA.
Front Scale (Trig scales:Deg-Min-Sec)
LL0, LL00, A [ B, K, CI, C ] D, S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht, Alexandria, VA

Year Codes
First letter in Date Code Example: J.K-1 = 1961

A B C D E F G H I J K L M
1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964
N O P Q R S T U V W X Y Z
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977

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