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Blaise Pascal invented a mechanical calculator.it used gears and leavs to add and subtract numbers.
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Charles Babbage designed the Analyticad engine. it could solve more than one math poroblem.
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Howard H Aiken built he first electrical calculator called Mark1. Mark1 was as long as half of a football field it used 500 miles of wires.
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John Presper eckert and John Mauclly made