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End Show History of Computers Ancient Times In the beginning, man used his fingers and toes to perform simple computations such as addition and subtraction. - ppt download
8 Amazing Mechanical Calculators Before Modern Computers
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PDF) Abacus computing tool: From history to application in mathematical education
History of Computers | Cjb07's Blog
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Abacus-World's first calculator | History of Computers
Abacus-World's first calculator | History of Computers
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Abacus Explained — Everything You Need To Know - History-Computer
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