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SIC slide rules were manufactured for Scientific Instruments in
Berkeley, California by Japanese manufacturers
Relay/Ricoh and Concise. SIC had custom models which added scale labels to the cursors, a handy, yet costly, technique which
was never duplicated on other brands or by other manufacturers. Note that on slide rules that have the SIC Diamond Logo, the rules have serial numbers
but do not have the pi (π) gauge mark on the A and B scales found on earlier slide rules without logos.
The linear SIC Models numbers are normally a Relay model number with
an extra zero (Relay 102 = SIC 1020). The SINCO logo was used in 1965 Note: Almost all the slide rules shown in this gallery were gifted to the Computer History Museum in Mountainview, California so we are left with virtual images (Ref: Pxxx, Cxx, Sxxx). If you have a physical replacement for the ISRM archives, your gift would be appreciated by all. |
 SIC 120 (Version 1)4"(Rototrig 200) REF |
SIC 120 (Version 1)4"(Rototrig 200) 1962 Made in Japan for Scientific Instruments Co. Front Scale: K, A, D ( C, CI, EI (spiral) ) Back Scale: L, DI, D T, S, T, S, T, T&S Stock Dimensions (mm): 108 Dia x 4  Box
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 SIC 120 4"(Rototrig 200) ISRM 21.06.10.12 
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SIC 120 4"(Rototrig 200) (Logo)1962 Made in Japan for Scientific Instruments Co. Front Scale: K, A, D ( C, CI, EI (spiral) ) Back Scale: L, DI, D T, S, T, S, T, T&S Cursor: has labels with TS Stock Dimensions (mm): 108 Dia x 4 Bob Dehn's Collection gifted by wife Fran (McGroary) Dehn of Menlo Park, California. 
Robert "Bob" Dehn (1941-2000) graduated from UC Berkeley with a degree in chemistry. Following his graduation, Bob started work as a pharmaceutical chemist at Stanford Research Institute, which later became SRI International. It was there that he spent his entire professional career. It was also at SRI that he met his wife of 52 years, Fran McGroary. After receiving his MBA from Santa Clara University, Bob moved into marketing and business development for the Life Sciences Division of SRI where he continued until his retirement in 2007..Bob began collecting with his first slide rule while studying at UC Berkeley. During his career he continued to collect from colleagues, antique shows and swaps.
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 SIC 120 (Version 1)4" C25 |
SIC 120 (Version 1)4" Made in Japan for Scientific Instruments Co. Front Scale: K, A, D ( C, CI, EI (spiral) ) Back Scale: L, DI, D T, S, T, S, T, T&S Stock Dimensions (mm): 108 Dia x 4  Box
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 SIC 120 (Version 2) REF |
SIC 120 (Version 2) - 1962 Made in Japan for Scientific Instruments Co. - 10.8cm Dia Front Scale: K, A, D ( C, CI, EI (spiral) ) Back Scale: L, DI, D T, S, T, S, T, TS Archive - Ted White Collection |
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 SIC 120-D 1963 Duplex 4" C38 |
SIC 120-D 1963 Duplex 4" Made in Japan for Scientific Instruments Co. Front Scale: K, A, D ( C, CI, B, EI (spiral) ) Back Scale: L3, L2, L, DI, D (C, T, S, T, S, T, T&S) |
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 SIC 130 (Version 1) 4-3/8" REF |
SIC 130 4-3/8" Made in Japan for Scientific Instruments Co. Front Scale: K, A, D ( C, CI, EI (spiral) ) Back Scale: L, DI, D T, S, T, S, T, T&S Stock Dimensions (mm): 108 Dia x 4 Note: This is the same exact SR as the 120, There may have been some early model number changes when the company first got started
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 SIC 151 MultiLog (1961) REF |
SIC 151 MultiLog (date code J.S.-3) 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, ST, T, 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. Scan provided by the Steve Seale Collection, Nashville, Tennessee |
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 SIC (Relay) 153 Master Trig ISRM 09.01.12.20 |
SIC (Relay) 153 Master Trig Made in Japan by Relay dc HS-2 (1957) 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 |
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SIC 250 3"(SINCO Rototrig 100) ISRM 18.04.13.01 |
SIC 250 3"(SINCO Rototrig 100) Made in Japan for Scientific Instruments Co. 1962 Front Scale: K, A, D ( C, CI, L ) Back Scale: D, T, S, T<45, S<45, T&S<5.8 Stock Dimensions (mm): 81 Dia x 3 Donated by Barbara Oppliger, belonged to husband Melvin Oppliger. The photo of Melvin Eugene Oppliger (c1941-2017) shows him on his way to Okinawa. On his second tour, he was stationed in Honolulu, Hawaii in support of the NIKE missle there. Gene served six years in the Army and opted out in 1966 after he met and married Barbara. He worked for Datsun from 1970 thru 1983 mostly as a parts rep, that is where his love for the 510 sedan began. He retired from John Snyder Tool Company in 2007 after 17 years as a automotive tool rep. He loved anything car related and driving. During retirement he enjoyed traveling with his wife of 51 years going cross-country in their motorhome. |
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SIC 250 3"(SINCO Rototrig 100) ISRM 15.08.29.06 
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SIC 250 3"(SINCO Rototrig 100) Made in Japan for Scientific Instruments Co. 1962 Note: there are two Patent:Numbers shown on the slide rule, 440028 and 130076. Neither of these show up in the USA or worldwide patent databases. Front Scale: K, A, D ( C, CI, L ) Back Scale: D, T, S, T<45, S<45, T&S<5.8 Stock Dimensions (mm): 81 Dia x 3 Gift Of Marylyn (Stubbs) Ulrich For George Ulrich. George W Ulrich (1938-2015) was one of the first to attend Marquette High School and Alton High School simultaneously. He took his skills in design and construction to McDonnell Aircraft's spacecraft and defense programs while attending Washington University night school. He retired from Boeing in 2003. During those years he served in the Army.In 1964 he married Alton resident Marilyn Stobbs and moved to Florissant, MO but retained his Knights of Columbus #460 membership. |
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 SIC 300B Concise (SIC 250D Prototype) ISRM 21.08.07.18 |
SIC 300B Concise (SIC 250D Prototype) Made in Japan by Concise for SIC - 1961 Front Scale: K, A, D ( C, CI, B, L ) Back Scale: LL3, LL2, D ( C, S Cos, T1 Cot1, T2 Cot2, ST Stock Dimensions (mm): 111 Dia x 3 Gift Of William Lisowski.  |
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 SIC-Relay 102 (SIC 1020) Basic Beginner JK-3 S520 | SIC-Relay 102 (Early prototype of SIC 1020) Made in Japan by Relay/Ricoh for SIC - code HK-3 Front Scale: A, [ B, CI, C ] D, K Back Scale: [ S, L, T ] D Stock Dimensions (mm): 280 x 28.5 x 8.5  Case Logo
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 SIC-Relay 550 (early prototype of SIC 5500) P104 | SIC-Relay 550 - Early
prototype of SIC 5500) Made in Japan by Relay/Ricoh for SIC - code HK-3 Front Scale: A, [ B, S, T, C ] D, K Back Scale: DF [ CF, CI, C ] D, L Stock Dimensions (mm): 175 x 24.5 x 4.8 |
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 SIC 1020 Basic Beginner S519 | SIC 1020 Basic Beginner - early Made in Japan by Relay/Ricoh for SIC - code JK-4 Front Scale: A, [ B, CI, C ] D, K Back Scale: [ S, L, T ] D Stock Dimensions (mm): 280 x 28.5 x 8.5  Case Logo
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 SIC 1020 Basic Beginner (Logo) S521 | SIC 1020 Basic Beginner sn90306 Made in Japan by Relay/Ricoh for SIC - code HK-3 Front Scale: A, [ B, CI, C ] D, K Back Scale: [ S, L, T ] D Stock Dimensions (mm): 280 x 28.5 x 8.5 |
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 SIC 1510 Astrolog - Adv. Gen. Eng. (1961) ISRM 22.10.15.02 |
SIC 1510 Astrolog (pre Diamond Logo) no S/N 1961 Made in Japan by Relay/Ricoh for Scientific Instruments Company (SINCO) Note: narrow rectangular cursor blocks. Front Scale (extended) LL-0, L, K, A [ B, S Cos, ST, T Cot, C ] D, DI, P, LL0 Back Scale: LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1 Stock Dimensions (mm): 351 x 47 x 7 Gift of David Zoumaras of San Diego, California.. 
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 SIC 1510 Astrolog - Adv. Gen. Eng. S511 |
SIC 1510 Astrolog (early) No S/N. Advanced General Engineering. Made in Japan by Relay/Ricoh for SIC - 1961 Logo Front Scale (extended) LL-0, L, K, A [ B, S Cos, ST, T Cot, C ] D, DI, P, LL0 Back Scale: LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1 Originally part of SIC retail display, Factory stock. Stock Dimensions (mm): 355 x 47 x 7 |
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 SIC 1510 Astrolog (w/Logo) - Adv. Gen. Eng. ISRM 22.07.06.46 |
SIC 1510 Astrolog (w/Logo) sn30446 Made in Japan by Relay/Ricoh for SIC - 1961 Note: Scale labels imprinted on cursor lens. Front Scale (extended) LL-0, L, K, A [ B, S Cos, ST, T Cot, C ] D, DI, P, LL0 Back Scale: LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1 Stock Dimensions (mm): 351 x 47 x 7 Gift of Cindy Tate, Bozeman, Monatna Victor B. Tate II Collection. 
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 SIC 1520 S515 |
SIC 1520 Master Trig (early) Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale: K, A [ B, S Cos, ST, T Cot, C ] D, DI Back Scale: DF [ CF, CIF, CI, C ] D, L Stock Dimensions (mm): 322 x 40 x 7 |
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 SIC 1520 Multiphase Deca Trig (Logo) ISRM 14.01.10.43 |
SIC 1520 Multiphase DecaTrig - S/N 40157 Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale: K, A [ B, S Cos, ST, T Cot, C ] D, DI Back Scale: DF [ CF, CIF, CI, C ] D, L Stock Dimensions (mm): 320 x 40 x 7 Original Owner: Ed Zimmer, written on flap of sleeve. Initials on end of stock. Gift of the Bill Wehrend Collection, Palo Alto, California. 
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 SIC 1530 Technilog S513 |
SIC 1530 Technilog - (early) Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale: LL0, K, A [ B, S Cos, ST, T Cot, C ] D, DI, LL00 Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Stock Dimensions (mm): 322 x 39.5 x 7 |
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 SIC 1530 Technilog (Logo) S514 |
SIC 1530 Technilog - S/N 30805 Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale: LL0, K, A [ B, S Cos, ST, T, T Cot, C ] D, DI, LL00 Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Stock Dimensions (mm): 319 x 40.5 x 7 |
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 SIC 1530 Technilog ISRM 09.01.12.119 |
SIC 1530 Technilog Made in Japan by Relay/Ricoh for SIC - 1961 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 Stock Dimensions (mm): 319 x 40.5 x 7 Donated by David Hecht, Alexandria, VA |
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 SIC 1530 Technilog (Logo) ISRM 09.01.12.120 |
SIC 1530 Technilog Made in Japan by Relay/Ricoh for SIC - 1964 Front Scale: LL1, K, A [ B, T, T Cot, ST, S Cos, C ] D, DI, LL1, L Back Scale: LL2, LL3, DF [ CF, CIF, CI, C ] D, LL3, LL2 Stock Dimensions (mm): 319 x 40.5 x 7 Donated by David Hecht, Alexandria, VA |
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 SIC 1570 Electro Vector Log Log S510 |
SIC 1570 Electro Vector Log Log (early) Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale: Sh1, Sh2, A [ B, K, Th, C ] D, Tr1, Tr2, db Back Scale (Note: special LL' scale on C scale) Sr, Sθ Sθ, P', P [ Q, CF, CI, C LL' ] D, DF, LL2, LL3 Originally part of SIC retail display, Factory stock. Stock Dimensions (mm): 355 x 47 x 7 |
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 SIC 1570 Electro Vector Log Log (Logo) S509 |
SIC 1570 Electro Vector Log Log - sn30512 Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale: Sh1, Sh2, A [ B, K, Th, C ] D, Tr1, Tr2, db Back Scale (Note: special LL' scale on C scale) Sr, Sθ Sθ, P', P [ Q, CF, CI, C LL' ] D, DF, LL2, LL3 New Factory Box Stock Dimensions (mm): 351 x 47 x 7 |
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 SIC 1580 Electro Vector Log Log DecaTrig S517 |
SIC 1580 Electro Vector Log Log DecaTrig (early) Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale (extended) Sh2, Sh1, Th, A [ BI, S Cos, T Cot, CI, C ] D, LL3, LL2, LL1 Back Scale: X2, X1, P2, P1 [ Q, Y, L, LX, I ] I, Lθ1<45 Lθ1>45, Lθ2>45 Lθ2<45, LY Originally part of SIC retail display, Factory stock Stock Dimensions (mm): 355 x 46.5 x 7 |
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 SIC 1580 Electro Vector Log Log DecaTrig (Logo) S518 |
SIC 1580 Electro Vector Log Log DecaTrig sn30152 Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale (extended) Sh2, Sh1, Th, A [ BI, S Cos, T Cot, CI, C ] D, LL3, LL2, LL1 Back Scale: X2, X1, P2, P1 [ Q, Y, L, LX, I ] I, Lθ1<45 Lθ1>45, Lθ2>45 Lθ2<45, LY New Factory Box Stock Dimensions (mm): 352 x 46.5 x 7 |
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 SIC 1610 1962 5"(Rotolog 400) C31 |
SIC 1610 (logo) 1962 5"(Rotolog 400) Made in Japan for Scientific Instruments Co. Front Scale: LL3, LL2, LL1, LL0, K, A, D ( C, CI, B, EI(spiral) ) Back Scale: LL03, LL02, LL01, LL00, L, DI, D, T, S, T, S, T, TS ) New Factory Box Stock Dimensions (mm): 128 Dia x 4 |
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 SIC 1610 1962 5"(Rotolog 400) C33 |
SIC 1610 (logo) 1962 5" (Rotolog 400) Made in Japan for Scientific Instruments Co. Front Scale: LL3, LL2, LL1, LL0, K, A, D ( C, CI, B, EI(spiral) ) Back Scale: LL03, LL02, LL01, LL00, L, DI, D, T, S, T, S, T, TS ) New Factory Box Stock Dimensions (mm): 128 Dia x 4 |
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 SIC 1610-D Duplex 5" (Rotolog 500) C34 |
SIC 1610-D Duplex 1963 5" (Rotolog 500) Made in Japan for Scientific Instruments Co. Front Scale: LL3, LL2, LL1, LL0, K, A, D ( C, CI, B, EI(spiral) ) Back Scale: LL03, LL02, LL01, LL00, P, L, DI, D ( C, T, S, T, S, T, TS ) Stock Dimensions (mm): 128 Dia x 4  Box
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 P246 SIC 4030 Junior Mannheim - early P246 | SIC 4030 Junior Mannheim - early Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale: 4in // A, [ B, CI, C ] D ||10cm Back Scale: [ S, L, T ] D New Factory Box Stock Dimensions (mm): 118 x 19[23] x 6 |
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 SIC 4030 Junior Mannheim (Logo) ISRM 21.08.07.36 | SIC 4030 Junior Mannheim - sn30151 Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale: 4in // A, [ B, CI, C ] D ||10cm Back Scale: [ S, L, T ] D New Factory Retail Box Stock Dimensions (mm): 118 x 19[23] x 6 Gift Of William Lisowski  |
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 SIC 4500 Junior Multiphase P250 | SIC 4500 Junior Multiphase Made in Japan by Relay/Ricoh for SIC Berkeley, California Front Scale: A, [ S, L, T ] D Back Scale: DF [ CF, CI, C ] D New Factory Box Stock Dimensions (mm): 155 x 25 x 5 |
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 SIC - Scientific Instruments 4500 P243 | SIC 4500 Made in Japan by Relay/Ricoh for SIC Berkeley, California Front Scale: A, [ S, L, T ] D Back Scale: DF [ CF, CI, C ] D Originally part of SIC retail sales display Stock Dimensions (mm): 155 x 25 x 5 |
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 SIC 4500 Junior Multiphase (Logo) P251 | SIC 4500 Junior Multiphase - sn30461 Made in Japan by Relay/Ricoh for SIC Front Scale: A, [ S, L, T ] D Back Scale: DF [ CF, CI, C ] D New Factory Box Stock Dimensions (mm): 155 x 25 x 5 |
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 SIC 5050 Pocket Mannheim P248 | SIC 5050 Pocket Mannheim - early Made in Japan by Relay/Ricoh for SIC - (c)1961 (no SIC Logo) Front Scale: 13cm // A, [ B, CI, C ] D, K || 5in Back Scale: [ S, L, T ] D New Factory Box Stock Dimensions (mm): 148 x 24[29] x 7 |
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 SIC 5050 Pocket Mannheim (Logo) P249 | SIC 5050 Pocket Mannheim sn40116 Made in Japan by Relay/Ricoh - (c)1961 (SIC Diamond Logo on face) Front Scale: 13cm // A, [ B, CI, C ] D, K || 5in Back Scale: [ S, L, T ] D New Factory Box Stock Dimensions (mm): 148 x 24[29] x 7 |
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 SIC 5050 Pocket Mannheim (c)1961 ISRM 11.11.17.08 |
SIC 5050 Pocket Mannheim (c)1961 Made in Japan by Relay/Ricoh (SIC Diamond Logo on back) Front Scale: 13cm // A [ B, CI, C ] D, K || 5in Back scale: [S, L, T ] Back: Calculating Guide formulas Stock Dimensions (mm): 148 x 24[29] x 7 Donated by David Hecht, Alexandria, Virginia |
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 SIC - Scientific Instruments 5500 P242 | SIC 5500 Made in Japan by Relay/Ricoh (#550) branded for SIC Front Scale: A, [ B, S, T, C ] D, K Back Scale: DF [ CF, CI, C ] D, L Originally part of SIC retail sales display Stock Dimensions (mm): 175 x 24.5 x 4.8 |
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 SIC 5500 Pocket Multiphase P252 | SIC 5500 Pocket Multiphase early Made in Japan by Relay/Ricoh for SIC Front Scale: A, [ B, S, T, C ] D, K Back Scale: DF [ CF, CI, C ] D, L New Factory Box | ||
 SIC 5500 Pocket Multiphase P253 | SIC 5500 Pocket Multiphase sn31086 Made in Japan by Relay/Ricoh for SIC Front Scale: A, [ B, S, T, C ] D, K Back Scale: DF [ CF, CI, C ] D, L New Factory Box | ||
 SIC 5510 Astrolog 5 P241 |
SIC 5510 Astrolog 5 (early) Made in Japan by Relay/Ricoh for SIC - 1961 Front Scale (extended) LL-0, L, K, A [ B, S Cos, ST, T Cot, C ] D, DI, P, LL0 Back Scale: LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1 New Factory Box Stock Dimensions (mm): 170 x 35.5 x 5 |
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 SIC 5510 Astrolog 5 (Logo) ISRM 21.08.07.37 |
SIC 5510 Astrolog 5 - Advanced General Engineering Made in Japan by Relay/Ricoh for SIC - 1961. sn90043. Front Scale (extended) LL-0, L, K, A [ B, S Cos, ST, T Cot, C ] D, DI, P, LL0 Back Scale: LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1 Stock Dimensions (mm): 170 x 35.5 x 5 Gift Of William Lisowski |
 Two types of Packaging Yellow/blue most recent |
 Circular SR Packaging Orange SINCO most recent |
 SINCO Ad - August 1965 |
 SIC Models 1966 |
 SINCO Circular Rotorules |
 SINCO Slide Rules |
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