The first mechanical calculating machines (1 ene 1700 año – 14 h 49 m, 1 jul 2019 año)

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The first mechanical calculating machines, developed by Wilhelm Schickhard, Blaise Pascal and Gottfried Wilhelm von Leibniz, were not much of a success since they were not very reliable. But they became the basis for the highly successful mechanical calculators built throughout the 19th and 20 century, when more accurate gears and wheels became available

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