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Abacus, the oldest calculator - ALOHA Mind Math
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The chinese abacus, history, how to use the chinese abacus
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ALOHA Mind Math | Abacus, the oldest calculator
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Is this the first wearable computer? 300-year-old Chinese abacus ring
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The Chinese Abacus, History, How to Use the Chinese Abacus
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Chisanbop
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The Generations of Computer/People and Awesome Invention -Sara
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The Origin and Evolution of Abacus
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Abacus, the oldest calculator - ALOHA Mind Math
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Computers Everywhere: The Next generation of Interaction Paradigms