Misc. Japanese 計算尺
Slide Rule Gallery

This gallery is dedicated to Japanese slide rules and manufacturers. (Manufacturers not found in their own gallery).

KEEP ISRM FREE!
Manufacturers/Brands Represented in this gallery:
Toyo, Alco, Bristol Line, Delta, E.TATA, Fuji, Hope, Intra, Jakar, Kutsuwa, Pilot, Royal, Santok Uchida Yoko, Unknown

More Japanese slide rules may be found in the Sun Hemmi and Relay/Ricoh galleries and additional rebranded Japanese made OEM slide rules may be found scattered amongst the Pickett, Post, United Kingdom, and United States galleries.


Toyo

Toyo Specialized Business Development Co.
Toyo Tokusen-Kogyo Kabusiki-Kaisha Seizou



P120 Toyo w/ Bamboo Cursor



REF Toyo w/ Bamboo Cursor (appeared on eBay)

Toyo w/ Bamboo Cursor- c1940-1945
Made in Japan - Manufacturer Presumed to be Relay
Front Scale
A, [ B, CI, C ] D
Back Scale: [ S, L, T ]
Archive - no longer in collection

Someone in Japan, Prior to, or during WWII provided this with a  bamboo cursor frame. It was given to a young American business woman, now a grand mother, as a gift by a Japanese visitor, prior to WWII. The company name is in the insert. At first I thought this was a one-of-a-kind, possibly a homemade cursor frame, but another showed up as being in Ed Chamberlain's collection, when he put it on eBay (sold for $100). My conclusion is that due to a shortage of steel the company (Toyo) that handed out these slide rules as a promotional item, made these useful with the bamboo frame. This specimens has the 'equivalents' sheet on the back.


Mika (Mickey) Shingo in Aichi, Japan translates the Japanese characters  as:  "Toyo Tokusen-Kogyo Kabusiki-Kaisha Seizou" which means, "Produced by Toyo Specialized Business Development Co., Inc." "Specialized Business Development" implies that this company's business was related to Japanese government (before 1945).



S316 Relay 150
S316 Relay 150 - c1940-1945
Made in Japan - Pre-1945 Relay - missing cursor
Front Scale (extended)
25cm // K, A, [ B, CI, C ] D, L || 10in
Back Scale: [ S, S&T, T ] Equivalents

I found this one that looks like the same company name (see insert) as my P120 above. This tells me that both slide rules must be made by Relay since the Japanese companies were very brand loyal and the distributor would not have used multiple competing suppliers. I assume that this one also had a bamboo framed cursor but it failed to survive the war.


Alco ®, Al Nyman & Son Inc., New York

The Alco brand was started in 1966 by Al Nyman in New York, NY to distribute foreign re-branded products to discount stores. In 1990 the company moved to Florida with locations in Doral and Miami. Other known products are pens, crayons, desk organizers, etc., and later non-prescription eye glasses. The Alco brand is no longer used in the United States.


P266 Alco Personal Calculator
Alco Personal Calculator
Made in Japan - Aluminum Addiator and Slide Rule
Front Scale
Mechanical Addiator (+ / -)
Back:
A [ B, CI, C ] D


ALCO 305 Basic Mannheim

ISRM 09.01.12.92

ALCO 305 Basic Mannheim - (c)1970
Made in Japan for Al Nyman & Son Inc. New York
Front Scale
A [ B, CI, C ] D, K
Back Scale:
[ S, L, T ]
Donated by David Hecht, Alexandria, VA


ALCO 305 Basic Mannheim in Retail Package

ISRM 09.03.24.01
ALCO 305 Basic Mannheim - (c)1970
Made in Japan for Al Nyman & Son Inc. New York
Front Scale
A [ B, CI, C ] D, K
Back Scale:
[ S, L, T ]


ALCO 578 Basic Mannheim in Retail Package
ISRM 12.05.02.05
ALCO 578 Basic Mannheim - (c)1970
Made in Japan for Al Nyman & Son Inc. New York
Front Scale
A [ B, CI, C ] D, K
Back Scale:
[ S, L, T ]
Owned by Ruth Moira (Kilby) Kane (1921-2007). Donated in her memory by her daughter Anne Kilby, Kingston, Washington
Ruth was a physicst for Livermore Labs, and her daughter, Ann, remembered that she said "I just wanted to see what a $1.00 slide rule looked like.". See other slide rules from this talented family in the Circular, K&E, Post and Pickett Galleries.

Bristol Line



Bristol Line P18-4 (1963)

ISRM 12.06.24.34
Bristol Line P18-4 - Simplex
Made in Japan
Front Scale
4in // A [ B, CI, C ] D, K
Back Scale: [S, ST, T ]
Donated by Anonymous collector and daughter Stephanie, Phoenix, Arizona


Bristol Line P19-5

ISRM 12.06.24.33
Bristol Line P19-5 - Simplex
Made in Japan
Front Scale
5in // K, A [ B, CI, C ] D, L
Back Scale: [S, ST, T ]
Donated by Anonymous collector and daughter Stephanie, Phoenix, Arizona

Delta - Ozi Seisakusho



P236 Delta - Ozi SeisaKusho
Delta - Ozi SeisaKusho
Made in Japan - Aluminum with stainless rod as used to retain slide
Front Scale
DF [ CF, CI, C ] D
Back: Blank


E. TATA.



E. TATA. Pocket Mannheim Calculating Rule
E. TATA. Pocket Mannheim Calculating Rule
Made in Japan - Bamboo Stock, similiar to Ricoh.
Front Scale
A [ B, CI, C ] D
Back: Blank
Ebay photo


E. TATA. No. 522 Beginner's Slide Rule
E. TATA. No. 522 Beginner's Slide Rule
Only the sleeve (Case) was found in the archive. It is shown here to establish that the model existed.


REF Fuji No. 42
Fuji No. 42
Made in Japan - 8 scales, Molded plastic construction. 150.5 x 27 x 4 mm
Front Scale
DF [ CF, CI C ] D
Back: [ S, L, T ]
Archive - Herman van Herwijnen's Slide Rule Catalogue

REF Fuji No. 51
Fuji No. 51
Made in Japan - 9 scales, Molded plastic construction. 150.5 x 27 x 4 mm
Front Scale
A [ B, CI, C ] D, K
Back: [ S, L, T ]
Archive - Herman van Herwijnen's Slide Rule Catalogue

REF Fuji No. 88
Fuji No. 88
Made in Japan - 9 scales, Molded plastic construction. 225x30x4 mm
Front Scale
K, DF [ CF, CI, C ] D, A
Back: [ S, L, T ]
Archive - Herman van Herwijnen's Slide Rule Catalogue

S246 Fuji F-100
Fuji F-100
Made in Japan - 7 scales
Front Scale
DF [ CF, CIF, CI, C ] D, A
Back: Blank
Original Owner: NIB/Netherlands

REF Fuji F-102B
Fuji F-102B
Made in Japan - 12 scales, Molded plastic construction, 321x45x4 mm
Front Scale
K, S, A [ B, CI, C ] D, T, L
Back: [ S, L, T ]Blank
Archive - Herman van Herwijnen's Slide Rule Catalogue

REF Fuji (Wolters-Noordhoff) FJ-102
Fuji (Wolters-Noordhoff) FJ-102
Made in Japan - 14 scales, Molded plastic construction, 313x43x5 mm
Front Scale
L, DF [ CF, CIF, CI, C ] D, A, K
Back scales: 25cm [ S, ST, T1, T2 ]
Archive - Herman van Herwijnen's Slide Rule Catalogue

REF Fuji No. 104B
Fuji No. 104B
Made in Japan - 14 scales, Molded plastic construction, 320x45x4 mm
Front Scale
T1 Cot, T2 Cot, K, A [ B, CI, C ] D, S Cos, ST, L
Back: blank
Archive - Herman van Herwijnen's Slide Rule Catalogue

REF Fuji No. 106
Fuji No. 106
Made in Japan - 13 scales, Molded plastic construction, 320x45x3.8 mm
Front Scale
T Cot, ST Cot, DF [ CF, CIF, CI, C ] D, A, S Cos
Back: blank
Archive - Herman van Herwijnen's Slide Rule Catalogue

REF Fuji No. 112 (Wolters-Noordhoff)
Fuji (Wolters-Noordhoff) No. 112
Made in Japan - 14 scales, Molded plastic construction, 313x43x5 mm
Front Scale
L, DF [ CF, CIF, CI, C ] D, A, K
Back scales: 25cm [ S, ST, T1, T2 ]
Archive - Herman van Herwijnen's Slide Rule Catalogue

S192 Fuji 129 Student Log
Fuji 129 Student Log
Made in Japan - 14 scales
Front Scale
L, K, A [ B, CI, C ] D, S, ST, T
Back Scale
25cm [ S, LL-1, LL-2, LL-3 ] 10inch

S253 Fuji 129-01 Student Log
Fuji 129-01 Student Log
Made in Japan - Note: The bridges were put on the opposite side
Front Scale
L, K, A [ B, CI, C ] D, S, ST, T
Back Scale
25cm [ S, LL-1, LL-2, LL-3 ] 10inch
Original Owner: NIB/Netherlands


Fuji QuateLog No201P Log/Log

ISRM 13.02.13.04
Fuji QuateLog No201P Log/Log
Made in Japan - 20 scales
Front Scale
25cm // LL1, LL2, LL3, A DF [ B, BI, CI, C ] D, P, K, LL0
Back Slide:
T2 Cot2, T Cot, L, S Cos
Back: blank
Note: This specimen is in its original retail box and plastic sleeve. No instructions.
Gift of Phillip Rodley of UpperHutt, New Zealand
This slide rule and others in the ISRM archives and galleries were donated through the generosity and support of Phillip Rodley. Phil is very enthusiatic in finding slide rules in New Zealand that are not available to the rest of the world, and gifting them to ISRM. He enjoys the American brands that have leather sleeves and belt loops.


Fuji No. 203B

ISRM 13.08.12.01
Fuji No. 203B
Made in Japan - 8 scales. no trig scales.
Front Scale
25cm // A [ B, CI, C ] D, K \\ 10inch
Back Slide: Blank
Back: blank
Note: This specimen is in a model 129 retail box and plastic sleeve, with instructions.
Gift of Phillip Rodley of UpperHutt, New Zealand


Fuji No.251 Rietz c1955

ISRM 13.10.09.02
Fuji No.251 Rietz c1955
Made in Japan - 20 scales
Front Scale
25cm // K, A [ B, CI, C ] D, L
Back slide: [ S Cos, ST, T Cot ]
Back: blank
Original owner: Pam Frost '55, scratched on back of stock.
Gift of Phillip Rodley of UpperHutt, New Zealand
Note: Need to add scan of back of slide. See example below.

REF Fuji No. 251 Rietz
Fuji No. 251 Rietz
Made in Japan - 13 scales, Molded plastic construction, 290x40x4 mm
Front Scale
25cm // K, A [ B, CI, C ] D, L
Back scales: [ S Cos, ST, T Cot ]
Archive - Herman van Herwijnen's Slide Rule Catalogue


P156 Fuji 505 Rietz
Fuji 505 Rietz
Made in Japan - 7 scales
Front Scale
13cm // K, A [ B, CI, C ] D, L
Back Scale
[ S, ST, T ]


P156 Fuji 534S Rietz
Fuji 534S Rietz
Made in Japan - 7 scales, 150x35x4 mm
Front Scale
13cm // K, A [ B, CI, C ] D, L \\ 5inch
Back Scale
[ S, ST, T ]
Archive - Herman van Herwijnen's Slide Rule Catalogue


P156 Fuji 534S Rietz
Fuji 534S Rietz
Made in Japan - 7 scales, 150x35x4 mm
Front Scale
13cm // K, A [ B, CI, C ] D, L \\ 5inch
Back Scale
[ S, ST, T ]
Archive - Herman van Herwijnen's Slide Rule Catalogue


P157 Fuji 535s
Fuji 535s
Made in Japan - 8 scales
Front Scale
13cm // A [ B, CI, C ] D, K \\ 5in
Back Scale
[ S, L, T ]


P156 Fuji 536C Log Log
Fuji 536S Log Log
Made in Japan - 14 scales, 150x34x4 mm
Front Scale
13cm // S, T, A [ B, CI, C ] D, K, P
Back Scale
[ L, LL1, LL2, LL3 ]
Archive - Herman van Herwijnen's Slide Rule Catalogue


P052 Fuji 552P Duplex Log/Log
Fuji 552P Duplex Log/Log
Made in Japan - 23 scales
Front Scale
LL-0, K, A [ B, T, S, C ] D, P, L, LL0
Back Scale
LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1


REF Fuji 553P Duplex Log/Log
Fuji 553P Duplex Log/Log
Made in Japan - 23 scales
Front Scale
T1, T2, DF [ CF, CIF, CI, C ] D, P, S Cos, ST Tan
Back Scale
LL-1, LL-2, LL-3, A [ B, L, K, C ] D, LL3, LL2, LL1
Multiple Hairlines
Archive - Scan provided by Koen Schram, Netherlands


Fuji 1200 Duplex Log/Log

ISRM 12.06.24.30
Fuji 1200 Duplex Log/Log
Made in Japan - 17 scales
Front Scale
L, DF [ CF, CIF, CI, C ] D, K
Back Scale (extended)
RLL, LL, A [ B, S(5.5°-90°), T(5.5°-45°), K, C ] D, DI
Multiple Hairlines
Note: slide rule body has a light green tint to it
Donated by Anonymous collector and daughter.
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.


Fuji 1250S Duplex Log Log

REF
Fuji 1250S Duplex Log Log
Made in Japan - 27 scales, 335.5x49x5 mm
Front Scale (extended)
LL-1, LL-2, LL-3, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
T1 Cot, T2 Cot, DF [ CF, CIF, CI, C ] D, P, S Cos, ST Cos
Archive - Herman van Herwijnen's Slide Rule Catalogue


Fuji 1280 Duplex Log/Log

REF
Fuji 1280 Duplex Log/Log
Made in Japan - For Electrical and Mechanical Engineers.
Front Scale
LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back Scale (extended)
L, K, A [ B, ST ST, T Cot, S Cos, C ] D, DI, LL0, LL-0
Multiple Hairlines" HP, Kw, C
Scan provided by Steve Searle Collection, Nashville, Tennessee.


Hope

Hope Slide Rule Mfg. Co., Ltd.
Shigets Building, No. 26-18, Asakusabashi, 2-chome, Taito-ku, Tokyo, 111 Japan
Tel: (03) (862) 7644, 7645
Cable Address: HOPESLIDE TOKYO


Hope No. 51 Mannheim

REF
Hope No. 51 Mannheim
Made in Japan - 9 scales, 285x40x3.5 mm
Front Scale: S, K, A [ B, CI, C ] D, L, T
Back Scale: Blank
Archive - Herman van Herwijnen's Slide Rule Catalogue


Hope No52-G Mannhiem

ISRM 13.02.13.02
Hope No52-G Mannhiem
Made in Japan - 9 scales
Front Scale
S, K, A [ B, CI, C ] D, L, T
Back: Original Owner name, Ian G. Angus, on stock and slide
Note: This specimen is in its plastic sleeve. No instructions.
Donated to ISRM by Phillip Rodley, New Zealand


Hope No. 53 Basic

REF
Hope No. 53 Basic
Made in Japan - 6 scales, 151x27x3 mm
Front Scale: A [ B, CI, C ] D, K
Back Scale: Blank
Archive - Herman van Herwijnen's Slide Rule Catalogue


Hope No. 54 Mannheim

REF
Hope No. 54 Mannheim
Made in Japan - 9 scales, 151x27x4 mm
Front Scale: A [ B, CI, C ] D, K
Back Scale: [ S, L, T ]
Archive - Herman van Herwijnen's Slide Rule Catalogue


Hope No. 57 Mannheim

REF
Hope No. 57 Mannheim
Made in Japan - 9 scales, 150x37x4.2 mm
Front Scale: 13cm // A [ B, CI, C ] D, K \\ 5inch
Back Scale: [ S, L, T ]
Archive - Herman van Herwijnen's Slide Rule Catalogue


S216 Hope 65-G
Hope 65-G - Closed simplex
Made in Japan by Hope Slide Rule Mfg. Co., Ltd.
Front Scale
LL3, LL2, LL1, A [ B, BI, CI, C ] D, DI, K, LL0
Back Scale
[ T1, T2, L, S ]
Back: blank


REF Hope 530
Hope 530 - Duplex
Made in Japan by Hope Slide Rule Mfg. Co., Ltd.
Front Scale
LL01, LL02, LL03 , A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
T Cot, ST arc, DF [ CF, CIF, CI, C ] D, P, S Cos
Archive - Kimura Satoru Collection, Japan


P147 Hope - Modine Pocket
Hope - Modine Pocket
Made in Japan, by Hope Slide Rule Mfg. Co., Ltd.
Front Scale
13cm // A, [ B, CI, C ] D, K \\ 5in
Back Scale: [ S, L, T ]
Back adv: Modine

Intra



REF Intra 1081
Intra 1081
Made in Japan for British Company Intra, presumed to be made by Uchida Yoko, Co
Front Scale
T2, T1, A [ B, BI, CI, C ] D, P, S Cos, ST
Back Scale
LL1, LL2, LL3 DF [ CF, CIF, CI, C ] D, L, K
Cursor: Multiple Hairlines
Scan contributed by Rod Lovette Collection, UK



Jakar 11 Pocket Rietz

ISRM 14.10.15.04
Jakar 11 Pocket Rietz
Made in Japan by Fuji for British Market
Front Scale
13cm // A [ B, CI, C ] D, K \\ 5in
Back Slide: [ S, L, T ]
Gift of Edward Wright, Odenton, Maryland
Manual 7.01Mb
Includes models 11 & 55 Rietz, 22 & 77 Darmstadt, 29 Student Log/Log,33 & 99 Duplex Log/Log, 66 Electro, and 88 College Duplex.


Jakar 22 Pocket Darmstadt with Insert

ISRM 12.05.05.02

Retail Box
Jakar 22 Pocket Darmstadt with Insert
Made in Japan by Fuji for British Market
Front Scale
13cm // LL2, LL3, A [ B, CI, C ] D, K, LL1
Back Slide: [ P, T, L, S ]
With black leather wallet in Retail box.
Donated by Richard Davis, Las Vegas, Nevada
Manual 7.01Mb
Includes models 11 & 55 Rietz, 22 & 77 Darmstadt, 29 Student Log/Log,33 & 99 Duplex Log/Log, 66 Electro, and 88 College Duplex.


S282 Jakar 29 Student Log/Log
Jakar 29 Student Log/Log
Made in Japan by Fuji for British Market
Front Scale:
L, K, A [ B, CI, C ] D, S, ST, T
Back Scale: 25cm [ S, LL2, LL3 ] 10in
Original Owner/Location: Unk/England


Jakar 29 Student Log/Log

ISRM 09.01.12.98
Jakar 29 Student Log/Log
Made in Japan by Fuji for British Market WHSmith
Front Scale:
L, K, A [ B, CI, C ] D, S Cos, ST, T Cot
Back Scale: 25cm [ S, LL2, LL3 ] 10in
Donated by David Hecht, Alexandria, VA

2.73MB


Jakar 33 Duplex LogLog Pocket

ISRM 12.05.05.03

Retail Box
Jakar 33 Duplex LogLog Pocket
Made in Japan by Fuji for British Market
Front Scale:
LL-0, K, A [ B, T Cot, S Cos, C ] D, P, L, LL0
Back Scale: LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
With black leather wallet in Retail box.
Donated by Richard Davis, Las Vegas, Nevada
Manual 7.01Mb
Includes models 11 & 55 Rietz, 22 & 77 Darmstadt, 29 Student Log/Log,33 & 99 Duplex Log/Log, 66 Electro, and 88 College Duplex.


S348 Jakar 66 Electro
Jakar 66 Electro
Made in Japan by Fuji for British Market
Front Scale
10in // K, E (Volt/Dynamo/Motor Efficiency), A(kw) [ B(PS), CI, C ] D, LL3, LL2, L
Back Scale: [ S cos, ST, T  cot ]
Cursor: Multiple Hairlines
Original Owner/Location: Unk/England
Manual 8.48Mb
Includes Jakar Model Nos 11 and 55 Rietz, 22 and 77 Dramstadt and 66 Electro.


Jakar 523A Pocket

ISRM 12.05.05.01

Retail Box
Jakar 523A Pocket
Made in Japan by Fuji for British Market - c1970
Front Scale
13cm // A [ B, CI, C ] D, K, 5in
Back Scale:[ S, L, T ]
Original Owner/Location: NIB/England
With green plastic wallet in Retail box.
Donated by Richard Davis, Las Vegas, Nevada


There is some evidence in that Hope and Kutsuwa may be the same


Kutsuwa 10 Inch Mannheim 'Engraved' Slide Rule

ISRM 13.11.05.02


Accompanying Insert Showing Conversions
Kutsuwa 10 Inch Mannheim 'Engraved' Slide Rule
Made in Japan - in Clear plastic sleeve
Material: Stock is made in 3 layers of plastic, the slide in two.
Front Scale
A, [ B, CI, C ] D, K
Back Scale: [ S, L, T ]
Note: Cursor flange was partially broken and tension spring is missing. Restored good enough for display
Gift Of Phillip Rodley, Upper Hutt, New Zealand

Instructions (6.83MB PDF



Kutsuwa No. 1004

REF
Kutsuwa No. 1004
Made in Japan - Retail Package
Front Scale
25cm // LL3, LL2, LL1, A, [ B, BI, CI, C ] D, DI, K, LL0
Back Scale: Blank.
Archive - Eric Marcotte, Ph.D Collection, Canada


P127 Kutsuwa FN-401 Pocket Mannheim
Kutsuwa FN-401 Pocket Mannheim
Made in Japan - Retail Package
Front Scale
A, [ B, CI, C ] D, K
Back Scale: [ S, L, T ]

Pilot, Japan



Pilot 200-A 8 inch Mannheim

ISRM 13.08.12.03

Pilot 200-A 8 inch Mannheim
Made in Japan
Front Scale: K, A [ B, CI, C ] D, L
Back: Blank
Gifted by Phillip Rodley of UpperHutt, New Zealand

Royal



Royal 1091 Log Log

ISRM 13.02.13.03
Royal 1091
Made in Japan probably by Uchida Yoko, Co
Front Scale
LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
T2, T1, ST, DF [ CF, CIF, CI, C ] D, P, S Cos
Note: In plastic sleeve, no instructions
Gifted by Phillip Rodley of UpperHutt, New Zealand


REF Royal 1091 Executive
Royal 1091 Executive
Made in Japan probably by Uchida Yoko, Co
Front Scale
LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
T2, T1, ST, DF [ CF, CIF, CI, C ] D, P, S Cos
Scan contributed by Rod Lovette Collection, UK


REF Royal 5091 Universita
Royal 5091 Universita
Made in Japan probably by Uchida Yoko, Co
Front Scale
LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
T2, T1, ST, DF [ CF, CIF, CI, C ] D, P, S Cos
Scan contributed by Rod Lovette Collection, UK


Royal Executive No. 5091

ISRM 12.09.26.01
Royal Executive No. 5091
Made in Japan probably by Uchida Yoko, Co
Front Scale (extended)
LL01, LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back Scale (extended)
T2 Cot, T1 Cot, L, A [ B, K, CI, C ] D, ST, S CosP
Donated to ISRM By Ville Koskinen, UK
Ville says that this slide rule's history is rather ambiguous. "My father was about to throw it away some years ago, and I salvaged it instead. It may have been bought in early 1970s in Finland and used in college -- or it may have belonged to a relative and then given to my father."

SANTOK, Japan



Santok Generic Pocket Slide Rule - Seaforth Promo

ISRM 13.06.20.05

Sleeve
Santok Generic Pocket Slide Rule - SEAFORTH Promo
Made in Japan by Santok, sleeve labed 'Seaforth'
Front Scale: A [ B, CI, C ] D, K
Back: Blank
Gifted by Phillip Rodley of UpperHutt, New Zealand
Instructions (1.46MB PDF


Santok Generic Pocket Slide Rule with linear scales

ISRM 13.07.03.07
Santok Generic Pocket Slide Rule with linear scales
Made in Japan by Santok, Japan
Front Scale: 13 // A [ B, CI, C ] D, K \\ 5in
Back scale: [ S, L, T ]
Back: Ads: Agastat Timing Instruments, Stimsonite Signal Products, ESNA Elastic Stop Nut Corp of America
Gifted by Daniel Swerdlow of Bethesda, Maryland
Instructions (1.37MB PDF

UCHIDA YOKO CO., LTD

Uchida Yoko was formed in 1917 and in 1925 the company entered into a domestic (Japan) sales contract to market the Hemmi Bamboo Slide Rule which later becomes its flagship product. The slide rule was an indispensable tool for engineers until the electronic calculator was developed. Sales of this product lay the foundation for later becoming a leading company in the educational market.
During the 1946-1962 Reconstruction Phase, the company utilized the distributor network established for its flagship product, the slide rule. Uchida Yoko enters the school market by marketing science materials for the classroom.
Several European brands, Kent, Royal, Technical Sales, Teknor, and even Nestler, to name a few, contracted with Uchida Yoko to make rebranded slide rules, but the ventures were short-lived with the rapid introduction of the electronic slide rule calculator.
More Uchida Yoko Corporate History


Uchida Yoko Co. Generic Mannheim

ISRM 13.06.25.09

Uchida Yoko Slide Rule Instructions (Cover)

Norma Tanner with Pickett Teaching slide rule
Uchida Yoko Co. Generic Mannheim
Made in Japan by Uchida Yoko Co. c1970
Front Scale
S, K, A [ B, CI, C ] D, L, T
Back: Blank
Gifted by Norma Tanner of Libertyville, Illinois
Norma has been a participant of the ISRM Slide Rule Loaner Program. In addition, she had her own collection that she loaned out to students. This one is part of the collection sent to ISRM. Norma writes: "After teaching math and/or science for 24 years, I am now enjoying retired life. Having been educated at MIchigan State University during a time when using a slide rule was the only technology available for advanced calculations, I decided to create a unit of study for my students that would introduce them to the slide rule. My goals were for students to strengthen their ability to estimate and use scientific notation, as well as to discover the historic significance of the slide rule. While it was hard for them to put aside their electronic calculators, they were fascinated, engaged, and thrilled when they could multiply 2 x 3 and actually get 6 instead of 5.9. In the end my students were happy to be reunited with their calculators, but had a new appreciation for the value of estimating, scientific notation, and accuracy in measurement. Goals met! "

Unknown Japanese Manufacturer



ISRM Model 883 (Unknown Manufacturer)
Model 883 (Unknown Manufacturer)
Made in Japan
Front Scale
K, DF [ CF, CI, C ] D, A
Back Scale
Equivalents[ S, L, T ] D, A
Donated by David Hecht, Alexandria, VA


Japanese Pocket Mannhiem (C.J. Edwards Promotional)
Pocket Mannhiem (C.J. Edwards Promotional)
Made in Japan
Front Scale
A [ B, CI, C ] D, K
Back Scale (flip slide over)
[ S, L, T ]
Note: Grey plastic sleeve
Back advertising: The C.J. Edwards Co. Cleveland, Ohio
Donated By Anonymous Collector and daughter


Japanese Pocket Mannhiem (ITT Defense Promotional)
Pocket Mannhiem (ITT Defense Promotional)
Made in Japan
Front Scale
13cm // A [ B, CI, C ] D, K \\ 5inch
Back Scale (flip slide over)
[ S, L, T ]
Note: Grey plastic sleeve
Back advertising: ITT Defense Communications Div. Nutley, New Jersey
Donated By Anonymous Collector and daughter


ISRM Japanese Pocket Mannhiem (Unknown Manufacturer)
Japanese Pocket Mannhiem (Unknown Manufacturer)
Made in Japan
Front Scale
13cm // A [ B, CI, C ] D, K \\ 5in
Back Scale (flip slide over)
[ S, L, T ]
Note: Grey plastic sleeve
Donated by David Hecht, Alexandria, VA


ISRM Model Pocket Mannhiem (Unknown Manufacturer)
Pocket Mannhiem (Unknown Manufacturer)
Made in Japan - Promotional slide rule for Fawick Airflex Clutches and Brakes
Front Scale
A [ B, CI, C ] D, K
Back Scale
[ S, L, T ]
Donated by David Hecht, Alexandria, VA

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