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Which invention is Charles Xavier Thomas de Colmar best remembered for?

Correct answer: The 'Arithmometer' mechanical calculator

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What people think about it: 2 Comments
GrannieAnnie
GrannieAnnie
Laudy Miss Claudy, It isn't mechanical. Works only by humans.
Laudy Miss Claudy
Laudy Miss Claudy
Wouldn't the abacus be the first mechanical calculator?
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