1954 1970
The Roos Company
Charvoz-Roos Corporation.
KEEP ISRM FREE!

Charvoz-Roos Corporation, 50 Colfax Avenue, Clifton, New Jersey
Charvoz-Roos - A U.S. distributor of drafting and engineering supplies based at one time in 50 Colfax Ave, Clifton, New Jersey, that sold Charvoz-Roos branded slide rules. In November, 1939, Charvoz, Inc., formed at 185 Hackensack Street in East Rutherford, NJ. as a joint venture between Andre Charvoz, president of Manufacture Francais de Compas of Ligney-en-Barre, France, and Samuel Sanders of Teaneck, N.J., president of L. Oppleman, Inc. The Roos Company of 280 Madison Ave., New York, was a partnership between Andre and Angele Charvoz, and Abel and Ethel R. Gottheimer, that was created (c1941) to manufacture painted wood and laminated wood slide rules in the United States presumably to replace foreign imports of slide rules during WWII. It is possible that parts of the Charvoz-Roos early slide rules were supplied by the U.S. slide rule manufacturer Acu-Rule as many parts are identical with other brands of the time. Roos began distributing Charvoz drafting supplies by 1945. After the war, Roos Company merged with Charvoz Inc. into Charvoz-Roos Corporation on June 14, 1946 and began importing re-branded Relay/Ricoh slide rules from "Occupied Japan". The manufacturing plant in East Rutherford, New Jersey was sold in 1953 and the Charvoz-Roos Manufacturing Company was in receivership. Around 1954 the company became just Charvoz, and slide rules were imported from the German company Aristo. Early Roos and Charvoz-Roos slide rules were identical to Post 1442, 1447-D, 1452-D, 1462 and Henschel 2020. A Charvoz-Roos PSR-200 is identical to a Relay 403 and an Aristo 909 is branded with just 'Charvoz'. See the Aristo page for more Charvoz branded slide rules



REF Charvoz-Roos SR-31
Charvoz-Roos SR-31 (Painted Scales on Wood Stock) c1942
Made by Lawrence - c1942 (Same as 10-B) for Charvos Roos
Material: Wood stock with printed scales
Front Scale:
A [ B, CI, C ] D, K
Back: Not Shown
Scan Donated by David Rance, The Netherlands


Charvoz-Roos PSR-101

ISRM 09.01.12.66
Charvoz-Roos PSR-101 (Wood Stock) c1940
Material: Wood stock with printed scales
Front Scale:
A [ C, CI, C ] D, K
Back Scale
Equivalents [ S, L, T ] Trig identities
Well: Fraction to decimals conversions
Donated by David Hecht, Alexandria, VA


Charvoz-Roos PSR-101D Pocket Duplex

ISRM 09.10.30.01
Charvoz-Roos PSR-101D Pocket Duplex 1949-1952
Made in USA. Based on W.J. Boos U.S. Patent 2,594,857 - Apr 29, 1952
Material: Laminated Wood stock with printed scales
Note: Same construction as Acu-Design (Acu-math) pocket duplex which has an all Vinyl Stock stock.
Front Scale:
A [ C, CI, C ] D, K
Back Scale
Equivalents [ S, L, T ] Trig identities


REF Charvoz-Roos Company PSR-102
Charvoz-Roos Company PSR-102
Made in USA by Charvoz-Roos - c1946
Front Scale
A [ B, CI, C ] D, K
Back Scale: [S, L, T ]
Back: Equivalents of Units
Archive - Tom Dilatush collection


REF Charvoz-Roos Company PSR-200
Charvoz-Roos Company PSR-200
Made in Occupied Japan by Sun Hemmi for Charvoz-Roos - c1945-1951
Front Scale
4in // A [ B, CI, C ] D || 10cm
Back Scale: [S, L, T ]
Back: Equivalents of Units
Archive - Scan provided by Cassou Olivier collection, France


REF The Roos Company SR-104
The Roos Company SR-104
Made in USA by The Roos Company - c1941
Front Scale
A [ B, CI, C ] D, K
Back Scale: [S, L, T ]
Back: Equivalents of Units
Archive - Chris Gillings collection


REF Charvoz-Roos SR-104
Charvoz-Roos SR-104
Made in USA Charvoz-Roos - c1941
Front Scale
A [ B, CI, C ] D, K
Back Scale: [S, L, T ]
Well: Table of Decimal equivalents
Back: Equivalents of Units
Archive - Tom Dilatush collection


S233 Charvoz-Roos SR-105
Charvoz-Roos SR-105
Made in USA by Charvoz-Roos - c1946
Front Scale
A [ B, CI, C ] D, K
Back Scale: [S, L, T ]
Back: Equivalents of Units
Channel: Fractional to Decimal


Charvoz-Roos SR-105D

ISRM 13.07.03.03

Note the unique rear hairline on lens captured by the right stock brace used to transfer the trig scals [ S, L, T ]. (image from Acu-math A-51).
Charvoz-Roos SR-105D (Duplex style)- c1949-1952
Made in USA by Acu-Design (Acu-math) Designed by Wilfred Boos
Based on W.J. Boos U.S. Patent 2,594,857 - Apr 29, 1952
Laminated wood stock. Also see Acu-Math A-51
Front Scale
A [ B, CI, C ] D, K
Back scale:
Equivalents [S, L, T ] Equivalents
Note: The ISRM specimen was missing the rear lens and was reconstructed by the ISRM Curator.
Donated by Daniel Swerdlow, Bethesda, Maryland
Daniel Swerdlow is a second-generation engineer from New York City and has degrees in electrical engineering from New York University and Michigan State University. He has done telecommunications engineering for major corporations and currently lives in the Washington, DC area and works at the United States Patent and Trademark Office. Dan has gifted most of his collection to ISRM to support the museum. Many specimens may be found in the various ISRM galleries.


S395 Charvoz-Roos SR-105M
Charvoz-Roos SR-105M
Made in USA - Note: same as Dietzgen 1767P (see S001)
Front Scale
A [ B, CI, C ] D, K
Back Scale: [S, L, T ]
Back: Equivalents of Units
Channel: Fractional to Decimal
Note: Metal reinforcement in well


P101 The Roos Company SR-108 Duplex
The Roos Company SR-108 (Plastic Braces)- c1944
Made in USA by The Roos Company (prior to Charvoz-Roos merger in 1946)
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, CI ] DI, D2, D
Manual 7.56Mb


P100 Charvoz-Roos SR-108 Duplex
Charvoz-Roos SR-108 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


S449 The Roos Company SR-109
The Roos Company SR-109 Duplex - c1941
Made by The Roos Company prior to Charvoz-Roos merger (1946)
Material: Wood stock with plastic laminate, plastic end pieces
Front Scale (Scale similar to Post 1457)
T Cot, DF [ CF, CIF, CI, C ] D, S Cos, ST
Back Scale
Fraction-Decimal [ B, K, L, C ] Trig identities


Charvoz-Roos SR-109

ISRM 13.09.17.01
Charvoz-Roos SR-109 Duplex - c1946
Made by The Roos Company prior to Charvoz-Roos merger (1946)
Material: Wood stock with plastic laminate, plastic end pieces
Front Scale (Scale similar to Post 1457)
T Cot, DF [ CF, CIF, CI, C ] D, S Cos, ST
Back Scale
Fraction-Decimal [ B, K, L, C ] Trig identities


Charvoz-Roos SR-109

ISRM 09.01.12.67
Charvoz-Roos SR-109 (Wood Stock) c1947
Material: Wood stock with plastic laminate, metal braces
Front Scale (Scale similar to Post 1457)
T Cot, DF [ CF, CIF, CI, C ] D, S Cos, ST
Back Scale
Fraction-Decimal [ B, K, L, C ] Trig identities
Donated by David Hecht, Alexandria, VA


Charvoz-Roos SR-109 un-branded

ISRM 13.09.04.01
Charvoz-Roos SR-109 un-branded (Wood Stock) c1950
Made by Charvos-Roos using Acu-Math parts
Material: Wood stock with plastic laminate.
Note 8 screw cursor which slides on grooved edge of stock.
Front Scale (Scale similar to Post 1457)
T Cot, DF [ CF, CIF, CI, C ] D, S Cos, ST
Back Scale
Fraction-Decimal [ B, K, L, C ] Trig identities
Donated by Bruce E. Van Deuson, Barnardsville, North Carolina.


S397 Charvoz-Roos SR-109
Charvoz-Roos SR-109 Duplex (Metal Stock)
Made in USA (possibly with Acu-Design parts)
Note: Magnesium stock with plastic laminate - 8 screw Cursor slides on grooved edge of stock, same as Acu-Math 90
Front Scale (Scale similar to Post 1457)
T Cot, DF [ B, K, L, C ] D, S Cos, ST
Back Scale
Fraction-Decimal [ CF, CIF, CI, C ] Trig identities


Charvoz-Roos SR-111 Trig-O-Log

ISRM 13.10.07.07
Charvoz-Roos SR-111 Trig-O-Log
Made in USA
Front Scale
LL0, LL00, A [ B, K, CI, C ] S, ST, T
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Warning: Clean carefully - not engine divided


REF Charvoz-Roos (SR-113) SuperTrig
Charvoz-Roos (SR-113) SuperTrig - c1946
Made in USA  - Celluloid laminate over wood
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
Identical to WWII era Post 1462
Archive - Tom Dilatush Collection


S344 Charvoz-Roos SR-113 SuperTrig
Charvoz-Roos SR-113 SuperTrig - c1950
Made in USA -All Plastic stock and slide, printed scales
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
Original owner: Joseph Ferguson, Belwood, Ontario, Canada
Warning: Do not clean this model - not engine divided


Charvoz-Roos Log-Log (Model Unknown)

ISRM 09.01.12.68
Charvoz-Roos Log-Log (Model Unknown) - c1950
Made in USA - Plastic Laminated Wood stock, printed scales
Front Scale
LL0, LL00, A [ B, K, L, C ] LL3, LL2, LL1
Back Scale
T Cot, DF [ CF, CIF, CI, C ] D, S Cos, ST
Warning: Do not clean this model - not engine divided Donated by David Hecht, Alexandria, VA


Aristo 801 Rietz (Charvoz-Roos)

ISRM 09.01.12.73
Aristo 801 Rietz - No Date Code
Made in Germany for U.S. Company Charvoz-Roos Corp., 10 Park Place, Wood Ridge, New Jersey (later 50 Colfax Avenue, Clifton, New Jersey)
Front Scale
K, A [ B, CI, C ] D, L
Back: Blank
Multiple hairlines: Kw, PS
Donated By david Hecht, Alexandria.
Retail box marked with price of $2.95


P160 Charvoz (Aristo) 829 Multi-Rietz
Charvoz (Aristo) 829 Multi-Rietz
Made in Germany - Charvoz
Front Scale
13cm, P, A [ B, T, ST, S ] D, DI, 5in
Back Scale:
K, DF [ CF, CIF, CI, C] D, L
Multiple hairlines
Adv: Charvoz
Original Location: Netherlands


Charvoz (Aristo) 870 Multilog

ISRM 09.01.12.69
Charvoz (Aristo) 870 Multilog
Made in Germany for US Brand Charvoz - date code 592 (1959)
Front Scale
LL00, K, A [ B, T Cot, ST, S Cos, C ] D, DI, LL0
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Multiple hairlines: HP, KW
Donated by David Hecht, Alexandria, VA


CREI Charvoz (Aristo) 0903LL Scholar
Capitol Radio Engineering Institute

ISRM 09.01.12.70
CREI Charvoz (Aristo) 0903LL Scholar
Capitol Radio Engineering Institute

Made in Germany - date code G6011 (1960)
Front Scale
L, K, A [ B, CI, C ] D, S Cos, ST ST, T Cot
Back - Slider
25cm [ S, LL2, LL3] 10in
Multiple hairlines
Donated by David Hecht, Alexandria, VA


S546 Charvoz (Aristo) 0905 Shut-Commerz (Commerce)
Charvoz (Aristo) 0905 Shut-Commerz (Commerce)
Made in Germany - for Charvoz
Front Scale
-%/+%, KZ [ T2, P, T1 ] Z, M, £, s/d
Back Scale: 25cm [ Blank] 10 inch


S351 Charvoz (Aristo) 909 MultiTrig
Charvoz (Aristo) 909 MultiTrig
Made in Germany
Front Scale
P, A [ B, T, ST, S ] D, DI
Back Scale
K, DF [ CF, CIF, CI, C ] D, L
Multiple hairlines: W, HP


Charvoz (Aristo) 0970 MultiLog (early)

ISRM 08.11.20.01
Charvoz (Aristo) 0970 MultiLog Date Code 593 (March 1959)
Made in Germany - note gold anodized metal ends and metal cursor
Front Scale
LL00, K, A [ B, T, ST, S, C ] D, DI, LL0
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Multiple hairlines: HP, KW
Contributed by Shell Thuet in 2007 (See Webpage). Professional Motorcycle race tuner. Shell Thuet was inducted in the American Motorcycle Hall of Fame in 2001. The Nomination Letter written by Mike Konshak, one of his past racers, who is also the curator of the Slide Rule Museum and also the author of Shell Thuet's Biography. Shell built and tuned winning Indian Scouts, Enfield's and Yamahas. See also his Pickett 800-ES
The following pictures (left to right) are from 1946, 1953, 1963 and 1975. Shell Thuet passed away in Victorville July 8, 2011 at age 98.


S064 Charvoz (Aristo) 0970 MultiLog (early)
Charvoz (Aristo) 0970 MultiLog Charvoz (early)
Made in Germany for USA brand Charvoz - note silver anodized metal ends and metal cursor
Front Scale
LL00, K, A [ B, T, ST, S, C ] D, DI, LL0
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Multiple hairlines: HP, KW
Original Owner/Location: CCJ/USA


S065 Charvoz (Aristo) 0970 (Modern)
Charvoz (Aristo) 0970 MultiLog (Modern)
Made in Germany for USA brand Charvoz - note plastic ends and plastic cursor
Front Scale
LL00, K, A [ B, T, ST, S, C ] D, DI, LL0
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Multiple hairlines: HP, KW

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