7 авг 130 г. до нашей эры - Abacus
Описание:
The abacus is a calculating tool that was in use in the ancient Near East, Europe, China, and Russia, centuries before the adoption of the written Hindu–Arabic numeral system. It was a way for merchants who traded goods to keep count of goods they bought and sold (to help count large numbers).
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7 авг 130 г. до нашей эры
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~ 2156 г назад