.............was the first manual calculating device.
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Abacus was the first calculating device
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A mechanical calculator, or calculating machine, is a mechanical device used to perform automatically the basic operations of arithmetic. ... Surviving notes from Wilhelm Schickard in 1623 reveal that he designed and had built the earliest of the modern attempts at mechanizing calculation.
A mechanical calculator, or calculating machine, is a mechanical device used to perform automatically the basic operations of arithmetic. ... Surviving notes from Wilhelm Schickard in 1623 reveal that he designed and had built the earliest of the modern attempts at mechanizing calculation.
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