Abacus#Russian abacus

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Science and technology

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What Wikipedia says

An abacus (pl. abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times, in the ancient Near East, Europe, China, and Russia, until largely replaced by handheld electronic calculators during the 1980s, with some ongoing attempts to revive their use.

Excerpt from the Wikipedia article “Abacus#Russian abacus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Auteur inconnu, Public domain, via Wikimedia Commons.