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File:Vintage Bowmar Electronic Pocket Calculator, Model MX-50 (aka 90505), Red LED Display, Sealed Battery, Made In USA, Circa 1973 (14591513119).jpg - Wikimedia Commons
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File:HP 35 Calculator.jpg - Wikimedia Commons
Casio Algebra FX Series - Wikiwand
History of the Calculator
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File:Pocket calculator-2.jpg - Wikimedia Commons
File:Vintage Texas Instruments Datamath Pocket LED Calculator, Model TI-2500, Version 3, Made in the USA, Circa 1973 (41029101670).jpg - Wikimedia Commons