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The Origin and Evolution of Abacus
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Abacus invented adding machine first who aids earliest calculation
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History of computer,generation of computer ~ information scan
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ALOHA Mind Math | Abacus, the oldest calculator
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The Indian Chinese Association: Chinese Abacus
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Abacus-World's first calculator | History of Computers
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ABACUS - A CALCULATING DEVICE OF BABYLONIAN ORIGIN
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History of computer,GENERATION OF COMPUTER ~ Information Scan
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The History Of The Calculator
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The Origin and Evolution of Abacus
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Computer History Timeline | Timetoast timelines
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Who Invented The First Adding Machine?