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Mechanical calculator - Wikipedia
Century Calculator: Compute Centuries Between Two Dates
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:max_bytes(150000):strip_icc()/blaise-pascal-calculating-machine-515214884-5c81fc9b46e0fb0001431954.jpg "Biography of Blaise Pascal, Inventor of the Calculator")
Biography of Blaise Pascal, Inventor of the Calculator
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Stumbled across the first commercially available calculator, used by Harvard astronomers at the turn of the last century. “The Millionaire” debuted in 1899, and could multiply two eight digit numbers in under
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JF Ptak Science Books: 18th Century Calculator for the Blind--Nicholas Saunderson, Mathematician
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