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The Abacus: A Journey Through Time to Uncover Its Origins - The
Who Invented the Abacus: A Brief History - EnthuZiastic
Who Invented the Abacus? Tracing the History of the Ancient Calculating
Tools Of The Trade: The Abacus : NPR Ed : NPR
Tools Of The Trade: The Abacus : NPR Ed : NPR
Who Invented the Abacus? A Historic Journey into Ancient Calculation