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The Roos Company
Charvoz-Roos Corporation.
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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


Charvoz-Roos SR-31
REF 		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 Pocket Mannheim c1939
ISRM 20.04.01.210		 Charvoz-Roos PSR-101 Pocket Mannheim (Wood Stock) c1939
Material: Painted wood stock with printed scales.
Note: Equivalents and well have paper labels
Note: Replica cursor is from a Sterling 587 pocket slide rule.
Front Scale: A [ C, CI, C ] D, K
Back Scale: Equivalents [ S, L, T ] Trig identities
Well: Fraction to decimals conversions
Donated by Philip Stanley


Charvoz-Roos Pocket (unmarked PSR-101)
ISRM 20.04.01.369		 Charvoz-Roos Pocket (unmarked 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 Philip Stanley


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


Charvoz-Roos Company PSR-102
REF 		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


Roos Company Pocket PSR-103A
ISRM 20.04.01.309		 Roos Company Pocket PSR-103A
Material: Plastic stock, rebranded Bruning 2401
Front Scale: 13cm // A [ C, CI, C ] D, K
Back Scale: [ S, L, T ]
Donated by Philip Stanley


The Roos Company SR-104
REF 		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


Charvoz-Roos SR-104
REF 		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


Charvoz-Roos SR-105
S233 		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-105
20.05.15.02		 Charvoz-Roos SR-105
Made in USA by Charvoz-Roos - c1946
Note: The plastic cursor is from a Sterling 587 pocket slide rule. Perfect fit.The Sleeve is from a K&E N4058W
Front Scale: A [ B, CI, C ] D, K
Back Scale: [S, L, T ]
Back: Equivalents of Units
Channel: Fractional to Decimal
\
Sterling 587 cursor


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


The Roos Company SR-108 Duplex
20.04.01.078		 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
Donated by Philip Stanley
Manual 7.56Mb


Charvoz-Roos SR-108 Dual Duplex
ISRM 17.08.24.04		 Charvoz-Roos SR-108 Dual 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


The Roos Company SR-109
S449 		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.


Charvoz-Roos SR-109
S397 		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


Charvoz-Roos (SR-113) SuperTrig
REF 		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


Charvoz-Roos SR-113 SuperTrig
S344		 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 Company PSR-200
ISRM 21.02.15.01 		Charvoz-Roos Company PSR-200
Made in Occupied Japan by Sun Hemmi for Charvoz-Roos - c1945-1951
Note: Magnifying lens is removable from the standard Hemmi cursor
Front Scale: 4in // A [ B, CI, C ] D || 10cm
Back Scale: [S, L, T ]
Back: Equivalents of Units


Charvoz-Roos Log Log SR-??? - c1945
ISRM 21.01.30.01
Charvoz-Roos Log Log SR-??? (Model Number Unknown) - c1945
Made in USA - Celluloid laminate over wood, plastic braces. Cursor style same as Acumath 150, but with a thicker stock.
Note: Because there is no model number it was probably intended for rebranding for another company.
Front Scale: LL0, LL00, A [ B, K, L, C ] LL3, LL2, LL1
Back Scale: T, DF [ CF, CIF, CI, C ] D, S Cos, ST
Gift Of Jeffrey J. Kornn


Charvoz-Roos Log-Log (Model Unknown)
ISRM 09.01.12.68		 Charvoz-Roos Log-Log SR-??? (Model Number Unknown) - c1950
Made in USA - Plastic Laminated Wood stock, printed scales, metal braces. Acumath 90A cursor.
Note: Same scale set as ISRM 21.01.30.01 above.
Note: Because there is no model number it was probably intended for rebranding for another company.
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


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


Aristo-Maverick (Charvoz) 20-0195
18.04.06.138
 Aristo-Maverick (Charvoz) 20-0195 - 1969
Made in Germany.
Front Scale: DF [CF, CIF, CI, C] D, A, K
Back Side
S, ST, L, T
Gift of the Leroy G. Hausler Family.
Leroy G. Hausler was a Pharmacist that collected slide rules. He was a member of the Oughtred Society from 2006 to 2016. Other specimens are also in the ISRM galleries.


Charvoz (Aristo) 0903 Scholar dc G5725 (1957)
ISRM 17.12.17.11
Charvoz (Aristo) 0903 Scholar dc G5725
Made in Germany - date code G5725 (1957)
Front Scale: 10in, K, A [ B, CI, C ] D, S, T
Back: Equivalents and settings
Multiple hairlines
Original owner: James J. Pennell Collection. Gifted by his daughter, Brenda Barnes, and son, Barry Pennell of Apex, North Carolina.
Jim was born in Wilkes County North Carolina, on June 9, 1927. His parents were Charles and Maggie Ellis Pennell, and he was the youngest of three sons. He was drafted twice serving in the Navy for eleven months during WWII and in the Air Force during the Korean War. While in the Air Force he was stationed in Japan for two years and developed a deep appreciation of that country and its culture. After leaving the military he went to work for the Federal Aviation Administration as an electronics technician caring for the navigation aids at Raleigh-Durham Airport for 25 years. He was a long-time committed member of Greenwood Forest Baptist Church where he proudly served on the properties committee for many years. He was an avid bowler and enjoyed golf and working on the home in Cary he lived in for 55 years.


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


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
Donated by David Hecht, Alexandria, VA


Charvoz (Aristo) 909 MultiTrig
S351 		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.


Charvoz (Aristo) 0970 (Modern)
S065 		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
Roos made OEM slide rules based on the SR-15.


Dietzgen 1767P National - Early Cursor
ISRM 18.09.17.34		 Dietzgen 1767P National - Early Cursor
Made in USA - See Lawrence 250-BT
Note: early Cursor, Paper back label
Front Scale
A [ B, CI, C ] D, K
Back Scale
10in [ S, L, T ] 25cm, Conversion Chart (label)
Gift Of Donald Bachelor Collection.


Dietzgen 1767P National
S394 		Dietzgen 1767P National - c1942
Made in USA - Same as Post 1446-D and Lawrence 250-BT
Front Scale
A [ B, CI, C ] D, K
Back Scale: [ S, L, T ]
Back: Early Conversion Chart (label)


Post 1446-D Student circaWWII
S502 		Post 1446-D Student - cWWII
Missing Cursor, same as Lawrence 250-BT and Dietzgen 1767P
Made in USA by lawrence Engineering
Front Scale
A [ B, CI, C ] D, K
Back Scale
[ S, L, T ]
Back: Conversion Chart
Note: Because the transitional delivery of the 1446 during WWII from other OEM's tham Hemmi had the 'K' scale, once the war was over and shipping from Japan began again, the 'K' scale was added to the post-WWII Post 1446.
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