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de Colmar, Charles Xavier Thomas

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de Colmar, Charles Xavier Thomas

(born 1785, Colmar, Fr.—died 1870, Paris) French mathematician. In 1820, while serving in the French army, he built his first arithmometer, which could perform basic addition, subtraction, multiplication, and division. The first mechanical calculator to gain widespread use, it became a commercial success and was still being used up to World War I.

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