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This category lists the [Mecanical calculators] invented by Charles-Xavier Thomas, de Colmar, also known as Thomas de Colmar. First patent in 1820. He also invented the name "Arithmomètre". This name became a generic name for some decades. See also Payen arithmometer for similar machines made by his mechanics after his death.

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Media in category "Thomas arithmometer"

The following 21 files are in this category, out of 21 total.