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A mechanical device for performing arithmetic calculations, according to one version, they originate from the Chinese counting device of Suanpan, according to another, they are of Russian origin. Represent a frame with a number of spokes; On them are strung knuckles, which are usually 10 pieces each. The accounts are one of the earliest computing devices and until the end of the 20th century they were used massively in trade and accounting until they were replaced by calculators.