Category:Thomas arithmometer

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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.

Subcategories

This category has the following 2 subcategories, out of 2 total.

Media in category "Thomas arithmometer"

The following 23 files are in this category, out of 23 total.