Also Canadian brands of Sun Hemmi, Hughes-Owens . and Geotec .
and Phillippine branded Sun Hemmi's sold as ODELCO.
For the USA branded versions go to

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



REF Hemmi 154 Electronic (20" scales) with 4 cursors
Hemmi 154 Electronic with 4 cursors
Made in Japan by Sun Memmi
Front Scale: Sx, Tx, Tθ [Th, Sh, Sh, C] D, L, X
Back Scale: DF, P', P [ Q, CF, CI, Sθ°] A, D, K
Archive - Herman van Herwijnen's SRC


REF Hemmi 200 Basic (20" scales)
Hemmi 200 Basic
Made in Japan by Sun Memmi
Front Scale: D6, D5, D4 [C6, C5, C4, C3, C2, C1] D3, D2, D1
Back Scale: DF6, DF5, DF4 [CF6, CF5, CF4, CF3, CF2, CF1] DF3, DF2, DF1
Note: The six C, D, DF and CF scales gives an effective scale length of 120 inches.
Archive - Amedeo Muscelli Collection (Venezuela)
Photo by Michael O'Leary


REF Hemmi 201 Basic (20" scales)
Hemmi 201 Basic
Made in Japan
Front Scale: L2.4, L1..3, L2.4, L1.3 [ C4, C3, C2, C1 ] D1, D2, D3, D4
Back Scale: K4,K3,K2,K1 [CF4, CF3, CF2, CF1] DF1, DF2, DF3, DF4
Note: The four C, D and K scales gives an effective scale length of 80 inches.
Archive - Herman van Herwijnen's SRC


REF Hemmi 201 Basic (20" scales)
Hemmi 201 Basic
Made in Japan
Front Scale: Front Scales: L2.4, L1..3, L2.4, L1.3 [ C4, C3, C2, C1 ] D1, D2, D3, D4
Back Scale: K4,K3,K2,K1 [CF4, CF3, CF2, CF1] DF1, DF2, DF3, DF4
Note: The four C, D and K scales gives an effective scale length of 80 inches.
Archive - Herman van Herwijnen's SRC


REF Hemmi 279 Expert Mechanical Engineering (20" scales)
Hemmi 279 for Expert Mechanical Engineer
Made in Japan
Front Scale
L, K, A [ B, T Cot, S Cos, ST, C ] D, LL0, LL/0
Back Scale
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Archive - Herman van Herwijnen's SRC


REF Sun Hemmi Model 1 (Export Version)		 Sun Hemmi Model 1 (Export version)
Made in Japan - Pre 1927, has a post 1970 cursor
Front Scale
10 in // A [ B, C ] D || 29cm
Back Scale:
[ S, L, T ]
Well: 30-55cm
Archive - Scan donated by Olivier (France)


REF Sun Hemmi Model 1 (Export Version)		 Sun Hemmi Model 1 (Export version)
Made in Japan - c1930
Front Scale
10 in // A [ B, C ] D || 29cm
Back Scale:
[ S, L, T ]
Well: 30-55cm
Archive - Scan donated by Olivier (France)


REF Sun Hemmi 22		 Sun Hemmi 22 date code FC
Made in Japan - Feb 1955
Front Scale
[ CI, C ] D, A
Archive - Marion Moon Collection


REF Sun Hemmi 22		 Sun Hemmi 22 date code FJ
Made in Japan - Oct 1955
Front Scale
[ CI, C ] D, A
Archive - Herman van Herwijnen's SRC


P192 Hemmi-Westinghouse 4 inch		 Hemmi-Westinghouse 4 inch
Made in Japan by Sun Hemmi for Westinghouse (U.S.)
Front Scale
4in || A [ B, CI, D || 10cm
Back Slider
[ S, L, T ]


P223 Hemmi 30 w/ Magnifier		 Hemmi 30 w/ Magnifier
Made in Occupied Japan - Note: A and B scale missing π symbol at 3.14
Front Scale
10cm // A [ B, CI, C ] D
Back Slider
[ S, L, T ]


P254 Hemmi 30		 Hemmi 30
Made in Japan - Note: A and B scale missing π symbol at 3.14
Front Scale
10cm // A [ B, CI, C ] D
Back Slider
[ S, L, T ]


P143 Hemmi 30 w/ Magnifier		 Hemmi 30 w/ Magnifier
Made in Japan
Front Scale
10cm // A [ B, CI, C ] D
Back Slider
[ S, L, T ]


P139_Hemmi 30 SKF		 Hemmi 30 SKF
Made in Japan - Date Code MD - Metal Cursor
Front Scale
10cm // A [ B, CI, C ] D
Back Slider
[ S, L, T ]


P141 Hemmi 32 w/ Magnifier		 Hemmi 32 w/ Magnifier
Made in Occupied Japan
Front Scale
4in // A [ B, CI, C ] D
Back Slider
[ S, L, T ]


P140 Hemmi 32 w/ Magnifier		 Hemmi 32 w/ Magnifier
Made in Japan - Date code GE
Front Scale
4in // A [ B, CI, C ] D
Back Slider
[ S, L, T ]


P177 Hemmi 34 RK		 Hemmi 34 RK
Made in Japan - Early Cursor
Front Scale
14cm // A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]


P136 Hemmi 34 RK		 Hemmi 34 RK
Made in Japan - Late model Cursor
Front Scale
14cm // A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]


S261 Hemmi 40 Occupied Japan		 Sun Hemmi 40 Occupied Japan
Made in Occupied Japan - Bamboo
Front Scale
A [ B, C ] D
Back Scale: [S, L, T]
Back: Conversions


S060 Sun Hemmi 45K 8"		 Sun Hemmi 45K 8"
Made in Japan - Bamboo
Front Scale
K, DF [ CF, CI, C ] D, A
Back Scale: [TI, L, SI]
Back: Conversions


REF Sun Hemmi Model 47 		Sun Hemmi Model 47
Made in Japan - c1930
Front Scale
10 in // [ CI, C ] D, A || 29cm
Back Scale:
[ S, L, T ]
Well: 30-55cm
Note: Same as Hemmi model 1, Hemmi changed their numbering system about 1927
Archive - Scan donated by Paul Ross (USA)


REF Sun Hemmi Model 47 (Export Version)		 Sun Hemmi Model 47 (Export version)
Made in Japan - c1930
Front Scale
10 in // [ CI, C ] D, A || 29cm
Back Scale:
[ S, L, T ]
Well: 30-55cm
Note: Same as Hemmi model 1, Hemmi changed their numbering system about 1927
Archive - Scan donated by Olivier (France)


S243 Sun Hemmi 64		 Sun Hemmi 64
Made in Japan - Bamboo
Front Scale (extended)
27cm // K, A [ B, CI, C ] D, L || 10inch
Back: Conversions, gauge marks
Multiple Hairlines.
Note: The original user added a secondary info label behind the stock


S243 Sun Hemmi 64T		 Sun Hemmi 64T
Made in Japan - Bamboo
Front Scale (extended)
27cm // K, A [ B, BI, CI, C ] D, DI, , L || 10inch
Back Scale: [T2 Cot2, , T1 Cot1, , S&T, S Cos, ]
Back: Conversions, gauge marks
Multiple Hairlines.
Archive - Herman van Herwijnen's SRC


REF Sun Hemmi 66 Rietz		 Sun Hemmi 66 Rietz
Made in Japan - Bamboo - Date Codes: LG HD
Front Scale (extended)
15cm // K, A [ B, CI, C ] D, L || 8cm-0-8cm
Back Scale: [S, S&T, T]
Back: Conversions, gauge marks
Multiple Hairlines.
Scan donated by the Owner, Dr. H. John Krijnen, (1946- ) Netherlands, a retired Anesthesiologist and pain specialist who studied at Leiden University. He bought and used slide rules like this one in his practice to calculate dosages of various drugs. He has published two books on the Great War and maintains an interest in slide rules, photography, markmanship and painting.


S243 Sun Hemmi 74 System Rietz - Kanthal Promotional		 Sun Hemmi 74 System Rietz - Kanthal Promotional
Made in Japan - Bamboo - has brass stock spacer
Front Scale (extended)
14cm // K, A [ B, CI, C ] D, L
Back Scale: [S, S&T, T]
Multiple Hairlines.


S410 Sun Hemmi 80/1 Electro		 Sun Hemmi 80/1 Electro
Made in Japan - Bamboo
Front Scale (extended)
27cm // K, A [ B, CI, C ] D, L || 10inch
Back Scale: Conversions, gauge marks
Well Scale: Dynamo/Motor (Efficiency), Volt (Drop)
Note: the aluminum knife edge on the slide and the backing have
been corroded away. This was found in Beijing, China.

Archive - No longer in collection


PREF Hemmi 143 Commerce		 Hemmi 143 Commerce
Made in Japan by Hemmi.
Front Scale
A, N [ M, £, s/d, C ] D, G (Conversions)
Back Scale
P1 %, P2 %, DF [ CF, CIF, CI, C ] D, LL, %
Archive - Herman van Herwijnen's SRC


PREF Hemmi 149A		 Hemmi 149A
Made in Japan by Hemmi.
Front Scale
L, K, A [ B, TI, SI, C ] D, LL0, LL/0
Back Scale
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Archive - Herman van Herwijnen's SRC


S230 Sun Hemmi 153		 Sun Hemmi 153 - For Electrical Engineer
Made in Japan - Date code BC
Front Scale
L, K, A [ B, CI, C ] D, T, Gθ
Back Scale
θ, Rθ, P(sin) [ Q(cos), Q', C ] LL3, LL2, LL1


S324 Sun Hemmi 153		 Sun Hemmi 153 - For Electrical Engineer
Made in Japan - Date code BF
Front Scale
L, K, A [ B, CI, C ] D, T, Gθ
Back Scale
θ, Rθ, P(sin) [ Q(cos), Q', C ] LL3, LL2, LL1


S325 Hemmi 251		 Sun Hemmi 251 - For Mechanical Engineer
Made in Japan - Date code BC
Front Scale
K, DF [ CF, CIF, C ] D, A
Back Scale
L, DF [ CF, CIF, CI, C ] D, D1


S034 Hemmi 251		 Sun Hemmi 251 - For Mechanical Engineer
Made in Japan - Date code GA
Front Scale
K, DF [ CF, CIF, C ] D, A
Back Scale
L, DF [ CF, CIF, CI, C ] D, D1


S071 Hemmi 255		 Sun Hemmi 255 - For Expert Electrical Engineer
Made in Japan - Date code EF- Had US Gov't on it
Front Scale
Sh1, Sh2, Th, A [ B, TI2, TI1, S1, C ] D, LL3, LL2, LL1
Back Scale
L, K, DF [ CF, CIF, CI, C ] D, X, Theta
Original Owner/Location: K.Fooshee/USA


S274 Hemmi 255D		 Sun Hemmi 255D - For Expert Electrical Engineer
Made in Japan - Date code MI - rearranged scales
Front Scale
Sh1, Sh2, Th, A [ B, TI2, TI1, S1, C ] D, DI, X, Theta
Back Scale
L, K, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Original Owner/Location: unk/USA


S033 Hemmi 256		 Sun Hemmi 256 - For Electric Communications
Made in Japan - Date code EE
Front Scale
A, L [ C, S1, T1 ] D, Lamda, F
Back Scale
L, db, Neper, DF[ CF, CIF, CI, C ] D, LL3, LL2, LL1
Original Owner/Location: Unk/Yuma, AZ


REF Hemmi 257		 Sun Hemmi 257 - For Chemical Engineer
Made in Japan by Sun Hemmi
Front Scale
L, A, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back Scale
Ch(A-M), Ch(N-Z), M1(Xw) [ M2(X), Temp(F,C,K)°, F(t) ] Kg/cm2, P mmHg(atm), P inHgVac(lb/in2 gage), tω(°C)
Archive - Herman van Herwijnen's SRC


REF Hemmi 257L		 Sun Hemmi 257L - For Chemical Engineer
Made in Japan by Sun Hemmi
Front Scale
L, K, A, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back Scale
Ch(A-M), Ch(N-Z), M1(Xw) [ M2(X), Temp(F,C,K)°, LM a/b, LM a:b ] mm hg, Kg/cm2, P mmHg(atm), P inHgVac(lb/in2 gage), tω(°C)
Archive - Peter Owen Collection


REF Hemmi 258 (Post 1460 Versalog) 		Hemmi 258 (Post 1460 Versalog)
Made in Japan by Hemmi - Date code BA - March 1951
Front Scale
LL/1, LL/2, LL/3 [ T/T, SecT/ST, Cos/S, C ] D, LL3, LL2, LL1
Back Scale
LL0, LL/0, K, DF [ CF, CIF, CI, C ] D, R1, R2, L
Note: Cos label printed in Black. This is the first and only version where Hemmi 258 appears on a Post Versalog
Donated by David Hecht, New York


S002 Hemmi 259		 Sun Hemmi 259 - For Expert Mechanical Engineer
Made in Japan
Front Scale
L, K, A [ B, T, S, ST, C ] D, LL0, LL/0
Back Scale
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Original Owner/Location: Paul Olson/Australia


S358 Hemmi 259-D dc-MB		 Sun Hemmi 259 - For Expert Mechanical Engineer
Made in Japan - date code MB
Front Scale
L, K, A [ B, T, S, ST, C ] D, DI, LL0, LL/0
Back Scale
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Original Owner/Location: George Ingram/U.S.A


REF Sun Hemmi 260 		Sun Hemmi 260
Made in Japan
Front Scale
LL/0, LL0, K, A [ B, T Cot, S Cos, ST, C ] D, DI, P, L
Back Scale
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Archive - Atsushi Tomozawa Collection (Japan)


ISRM Sun Hemmi P261 		Sun Hemmi P261
Made in Japan - date code XE (May 1973)
Front Scale
T Cot, ST ST, K, A [ B, BI, CI, C ] D, L, P, S Cos,
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Donated by David Hecht, Alexandria, VA


ISRM Sun Hemmi P262 		Sun Hemmi P262
Made in Japan - date code XG ( July 1973)
Front Scale
K, A R1, R2 [ T2 Cot2, T1 Cot1, ST ST, S Cos, C ] D, L, LL00, LL0
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Donated by David Hecht, Alexandria, VA


REF Hemmi 266 Electronic 		Sun Hemmi 266 Electronic - For Electronic Engineer
Made in Japan by Sun Hemmi
Front Scale
LL3-, LL2-, LL2 A [ B, BI, CI, L ] D, dB/L, S, T
Back Scale
XL, TL, Xc, R,Tc, F, fm, y1, P [ y2, Q, L, L, Cf, C, C, Cz ] L, Z, fo, λ
Archive - Herman van Herwijnen's SRC


REF Hemmi 269 - Civil		 Sun Hemmi 269 - For Civil Engineer
Made in Japan
Front Scale
L, F, K, A [ B, K', CI, C ] D, LL3, LL2, LL1
Back Scale
CL, SL, M, TL [ R, ST COS-COT, , T COT, , S COS, , C ] D, DI, , SIN COS (1), SIN COS (2)
Archive - Herman van Herwijnen's SRC


ISRM Sun Hemmi P280 (Ahrend 435660)		 Sun Hemmi P280 (Ahrend 435660)
Made in Japan by Hemmi for Dutch Company Ahrend - c1973
Front Scale
T Cot, K, A [ B, CI, C ] D, L, S Cos, ST ST
Back Scale
[ LL1, LL2, LL3 ]
Donated by David Hecht, Alexandria, VA


ISRM Sun Hemmi P281		 Sun Hemmi P281
Made in Japan - c1973
Front Scale
K, A [ B, CI, C ] D, L, T Cot, S Cos
Back Scale
[ LL1, LL2, LL3 ]
Donated by David Hecht, Alexandria, VA


ISRM Hemmi P452 - Business, System H. Kroon		 Hemmi P452 - Business, System H. Kroon
Made in Japan - date code UC (Mar 1970)
Front Scale
LL1, LL2, LL3, CR DF [T CF, CIF, % CI, T C] R D, L, in, cm
Back Scale
ST, 3n-2 K, 2n-1 A [B, BI, CI, C] D, P, S, T
Donated by David Hecht, Alexandria, VA


P137 Hemmi 2634		 Hemmi 2634 - For General Engineer
Made in Occupied Japan
Front Scale
5in // K, DF [ CF, CI, C ] D, A
Back Slider
[ TI1, TI2, L, SI1 ]


S022 Hemmi 2664S		 Sun Hemmi 2664S - For General Business
Made in Japan
Front Scale
Inch Ruler, A [ B, CI, C ] D, K, Metric Ruler
Back Slider
[ S, L, T ] Back: Conversion Chart
Hughes-Owens/Geotec


ISRM Hugh-Owens 1766 Electronic		 Hugh-Owens 1766 - Electronic
Made in Japan by Sun Hemmi
Front Scale
K, A [ B, CI, C ] D, T
Back Scale
θ, Rθ, P(sin) [ Q(cos), Q', C ] LL3, LL2, LL1
Donated by David Hecht, Alexandria, VA


S314 Hugh-Owens 1768 Mannhiem		 Hugh-Owens 1768
Made in Japan by Hemmi for Canadian Distributor H-O
Front Scale
A [ B, C ] D
Back Slider
[ S, L, T ]


REF Hugh-Owens 1768C Mannhiem		 Hugh-Owens 1768C - date code PA (Jan 1965)
Made in Japan by Hemmi for Canadian Distributor H-O
Front Scale
A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]
Donated by David Hecht, Alexandria, VA


REF Hughes-Owens 1777 		Hughes-Owens 1777 (Same as Post 1460 Versalog)
Made in Japan by Hemmi - Date code HK - Nov 1957
Front Scale
LL/1, LL/2, LL/3 [ T/T, SecT/ST, Cos/S, C ] D, LL3, LL2, LL1
Back Scale
LL0, LL/0, K, DF [ CF, CIF, CI, C ] D, R1, R2, L
Note: Cos label printed in Black
Original Owner: F. Schmidt
Donated by David Hecht, Alexandria, VA


REF Hughes-Owens 341-3010 		Hughes-Owens 341-3010 (Same as Post 1460 Versalog)
Made in Japan by Hemmi - Date code SH - Aug 1968
Front Scale
LL/1, LL/2, LL/3 [ T/T, SecT/ST, Cos/S, C ] D, LL3, LL2, LL1
Back Scale
LL0, LL/0, K, DF [ CF, CIF, CI, C ] D, R1, R2, L
Note: Cos label printed in Green
Original Owner: John Kielly
Donated by David Hecht, Alexandria, VA


REF Geotec 341-3012 Versalog II 		Geotec 341-3012 Versalog II (Same as Post 1460 Versalog II)
Made in Japan by Hemmi - Date code: XE (May 1973)
Front Scale
L, LL/1, LL/2, LL/3 [ T/T, SecT/SRT, Cos/S, C ] D, LL3, LL2, LL1
Back Scale
LL/0, K, A, DF [ CF, CIF, CI, C ] D, R1, R2, LL0,
Note: Addition of A scale.
Scan provided by Ronald E. Kuc, Canonsburg, PA


ISRM Hughes-Owens 34-3120 Versatrig 		Hughes-Owens 34-3120 Versatrig
Made in Japan by Hemmi (same as Post 1450 Versatrig)
Front Scale
L, A [ T T, SecT ST, Cos S, C ] D, DI
Back Scale
K, DF [ CF, CIF, CI, C ] D, R1, R2
Donated by David Hecht, Alexandria, VA


P142 Hughes-Owens 341-3405 w/ Magnifier		 Hughes-Owens  341-3405 w/ Magnifier
Made in Japan - Late Era for Canada
Front Scale
4in // A [ B, CI, C ] D
Back Slider
[ S, L, T ]


S291 Hughes-Owens 341-3526 Student		 Hughes-Owens 341-3526 Student
Made in Japan by Hemmi. Same as H-O 1768C
Front Scale
A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]


P209 Hemmi Geotec 341-3425		 Hemmi Geotec 341-3425,  dc ID April, 1958
Made in Japan by Hemmi for Canada firm H-O, later Geotec
Front Scale
5in// A [ B, CI, C ] D, K
Back Slider
[ S, L, T ]


P138 Hughes-Owens B-35		 Hemmi Hughes-Owens B-35
Made in Japan by Hemmi for Canada firm H-O
Front Scale
5in // K, DF [ CF, CI, C ] D, A
Back Adv: Compliments of Hughes-Owens
ODELCO


P081 Hemmi 149A		 P081 Hemmi 149A
Made in Japan by Hemmi for Odelco in the Philippines.
Front Scale
L, K, A [ B, TI, SI, C ] D, LL0, LL/0
Back Scale
LL/1, LL/2, LL/3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Odelco Logo


REF Hemmi 257-L (Odelco)		 Sun Hemmi 257 (Odelco) - For Chemical Engineer
Made in Japan by Sun Hemmi for Odelco in the Philippines.
Front Scale
L, K, A, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back Scale
Ch(A-M), Ch(N-Z), M1(Xw) [ M2(X), Temp(F,C,K)°, LM ] mmHg, Kg/cm2, inHgVac, tω
Archive - Herman van Herwijnen's SRC

Click For more Hemmi
OEM Slide Rules
1958 Hemmi Catalog
1.13MB pdf
Pre-1940 Hemmi Slide Rule
Manufacturing Process
Many Hemmi and Post slide rules have date codes stamped into the body of the stock.
Two letters [Year][Month]. For those that don't, visit Paul Ross's Hemmi Slide Rule Catalogue Raisonne
and ISRM's Slide Rule Dates and Timelines

Year Codes
A B C D E F G H I J K L M
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962
N O P Q R S T U V W X Y Z
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
Month Codes
A B C D E F G H I J K L
Jan. Feb. Mar. Apr. May June July Aug. Sep. Oct. Nov. Dec.

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