on Oct 7, 2016
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A December 1900 ad stated that Comptometer were "in hundreds of railroad and insurance offices" and "used by accountants and engineers in all lines of business
Comptometers with wood cases were produced for about 16.5 years, from mid or late 1887 through 1903, after which cases were made of metal
In 1916, the manufacturer stated that Comptographs were marketed as early as 1891
Calculator, mechanical comptometer, made by Felt and Tarrant, Chicago Illinois, United States of America, 1915-1920
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