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/img/iea/Z3G8yRL6mE/brief-history-calculators.jpg "The Calculators Brief History: When was the calculator invented")
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Mechanical calculator - Wikipedia
Mechanical calculator - Wikipedia
:max_bytes(150000):strip_icc()/blaise-pascal-calculating-machine-515214884-5c81fc9b46e0fb0001431954.jpg "Biography of Blaise Pascal, Inventor of the Calculator")
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Mechanical calculator - Wikipedia
National Museum of American History
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