calculator which mechanical computing device for performing arithmetic operations isolated white background close |
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Abacus (Greek ????, Latin abacus - board) - a simple device for arithmetic calculations among the ancient Greeks and Romans in the form of a board divided into strips along which stones, coins, etc. were moved. Among the ancient abacuses, there are Greek (salamis) and Roman (calculus and manual abacus). In Western Europe, the abacus was used until the 17th century. The abacus of the 19th-20th centuries. in appearance and structure is a close analogue of the abacus |
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