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ALOHA Mind Math | Abacus, the oldest calculator

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Who invented the Abacus? Inventions and Inventors for kids***

Who invented the Abacus? Inventions and Inventors for kids***

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Fun Computer History Facts for Kids

Abacus-World's first calculator | History of Computers

Abacus-World's first calculator | History of Computers

The Origin and Evolution of Abacus

The Origin and Evolution of Abacus

ALOHA Mind Math | Abacus, the oldest calculator

ALOHA Mind Math | Abacus, the oldest calculator

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Computer History Timeline | Timetoast timelines