5.3 Charvoz-Roos, USA

Both Charvoz, Inc., of East Rutherford, New Jersey (1939) and the Roos Company of New York City, New York (1941) were founded to manufacture replacement slide rules during World War II for companies in the U.S. that relied on foreign imports, including the Frederick Post Company. After the war, manufacturing ceased and the two companies merged into the Charvoz-Roos Corporation in 1946, selling imports such as Aristo and others until going bankrupt in 1953.

Total number of Charvoz-Roos slide rules in the collection: 6. \(~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\)

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