Who Invented the Abacus: A Brief History - EnthuZiastic
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Der Alte Abakus Steht Auf Asphalt Mit Tiefen Rissen Und Moos. Ansicht Von Oben. Traditionelles Geschäftskonzept. Lizenzfreie Fotos, Bilder und Stock Fotografie. Image 171023524.
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Man uses vintage old wooden abacus. Media. Close up of male hand counting with a USSR soviet old fashioned calculating tool called counting frame. Stock Video Footage by ©MediaWhalestock #435022416
Abacus - Wikipedia
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abacus - Wiktionary, the free dictionary
