Stock Photo - Arithmometer, the first mechanical calculator to reach commercial success, designed by Xavier Thomas de Colmar (1785-1870) in 1820, France, illustration from the magazine L'Illustration, Journal Universel, vol 14, no 348, October 27, 1849. DeA / Veneranda Biblioteca Ambrosiana, Milan

Stock Photo: Arithmometer, the first mechanical calculator to reach commercial success, designed by Xavier Thomas de Colmar (1785-1870) in 1820, France.

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