Scientific Instruments Company - S.I.C.
Berkeley, California - Note: SINCO logo used in 1965

KEEP ISRM FREE!
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).



C20 SIC 120 (Version 1)4"(Rototrig 200)
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


C36 SIC 120 4"(Rototrig 200)
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
Stock Dimensions (mm): 108 Dia x 4
Box


C25 SIC 120 (Version 1)4"
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


REF SIC 120 (Version 2)
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


C38 SIC 120-D 1963 Duplex 4"
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)


REF SIC 130 (Version 1) 4-3/8"
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
Box
Instructions 8.15 MB


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


ISRM SIC (Relay) 153 Master Trig
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


C35 SIC 250 3"(SINCO Rototrig 100)
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


C37 Concise SIC 300B Duplex (Prototype of SIC 250D)
Concise SIC 300B Duplex (Prototype of SIC 250D)- 1961
Made in Japan by Concise for SIC
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


S520 SIC-Relay 102 (SIC 1020) Basic Beginner JK-3
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


P104 SIC-Relay 550 (early prototype of SIC 5500)
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


S519 SIC 1020 Basic Beginner
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


S521 SIC 1020 Basic Beginner (Logo)
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


S511 SIC 1510 Astrolog
SIC 1510 Astrolog (early)
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


S512 SIC 1510 Astrolog (Logo)
SIC 1510 Astrolog - sn40855
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
Originally part of SIC retail display, Factory stock.
Stock Dimensions (mm): 351 x 47 x 7


S515 SIC 1520
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


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.


S513 SIC 1530 Technilog
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


S514 SIC 1530 Technilog (Logo)
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


ISRM SIC 1530 Technilog
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


ISRM SIC 1530 Technilog (Logo)
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


S510 SIC 1570 Electro Vector Log Log
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 , 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


S509 SIC 1570 Electro Vector Log Log (Logo)
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 , P', P [ Q, CF, CI, C LL' ] D, DF, LL2, LL3
New Factory Box
Stock Dimensions (mm): 351 x 47 x 7


S517 SIC 1580 Electro Vector Log Log DecaTrig
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


S518 SIC 1580 Electro Vector Log Log DecaTrig (Logo)
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


C31 SIC 1610 1962 5"(Rotolog 400)
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


C33 SIC 1610 1962 5"(Rotolog 400)
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


C34 SIC 1610-D Duplex 5" (Rotolog 500)
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


P246 SIC 4030 Junior Mannheim - early
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


P247 SIC 4030 Junior Mannheim (Logo)
SIC 4030 Junior Mannheim - sn30662
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


P250 SIC 4500 Junior Multiphase
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


P243 SIC - Scientific Instruments 4500
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


P251 SIC 4500 Junior Multiphase (Logo)
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


P248 SIC 5050 Pocket Mannheim
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


P249 SIC 5050 Pocket Mannheim (Logo)
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


ISRM SIC 5050 Pocket Mannheim (c)1961
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


P242 SIC - Scientific Instruments 5500
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


P252 SIC 5500 Pocket Multiphase
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


P253 SIC 5500 Pocket Multiphase
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


P241 SIC 5510 Astrolog 5
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


P245 SIC 5510 Master Log Log Decatrig (Logo)
SIC 5510 Master Log Log Decatrig sn40479
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

Scientific Instruments Company Ephemera


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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