See abacus, Analytical Engine, Differential Analyzer, Difference Engine, Hollerith machine and Pascaline.
"early calculators." YourDictionary, n.d. Web. 23 June 2018. <http://www.yourdictionary.com/early-calculators>.
early calculators. (n.d.). Retrieved June 23rd, 2018, from http://www.yourdictionary.com/early-calculators
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