See abacus, Analytical Engine, Differential Analyzer, Difference Engine, Hollerith machine and Pascaline.
"early calculators." YourDictionary, n.d. Web. 09 December 2018. <https://www.yourdictionary.com/early-calculators>.
early calculators. (n.d.). Retrieved December 09th, 2018, from https://www.yourdictionary.com/early-calculators
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