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10 янв 2500 г. до нашей эры - Abacus (2700-2300 B.C.) The Abacus was an early calculating tool. It worked by shifting balls along a pole of metal.

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Robert Asztalos - Calculator Timeline

20 окт 2017

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10 янв 2500 г. до нашей эры

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~ 4528 г назад

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