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Why were mechanical calculators developed?

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User Invert
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Blaise Pascal invented a mechanical calculator with a sophisticated carry mechanism in 1642. ... Pascal's invention of the calculating machine, just three hundred years ago, was made while he was a youth of nineteen.
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User Hamid Behnam
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Blaise Pascal invented a mechanical calculator with a sophisticated carry mechanism in 1642. ... Pascal's invention of the calculating machine, just three hundred years ago, was made while he was a youth of nineteen.

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User Charlesdg
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