Thomas de Colmar costruisce l’aritmometro, prima calcolatrice su scala industriale in grado di svolgere le 4 operazioni aritmetriche, senza errori. In 30 anni ne vengono prodotti 1500 esemplari e la produzione si protrasse fino al 1930 circa.
Utilizzava il principio del tamburo a passi ideato da Leibniz.
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