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Abacus-World's first calculator | History of Computers
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Abacus-World's first calculator | History of Computers
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:format(jpeg)/cdn.vox-cdn.com/uploads/chorus_image/image/53504315/GettyImages_630805159.0.jpg "I learned how to do math with the ancient abacus — and it changed my life - Vox")
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The Abacus: A Brief Introduction
