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When was abacus invented? – when was it invented?
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The Origin and Evolution of Abacus
When was Abacus invented? – When was it invented?
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ABACUS - A CALCULATING DEVICE OF BABYLONIAN ORIGIN
Suda's Space: From stones and sticks to bits and bytes,the saga of
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Wearable Abacus: Why Smartwatches And Gadgets Aren't As New As You