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File:Vintage Casio Personal-Mini Electronic Pocket Calculator, Made in Japan, Circa 1975 (11979568385).jpg - Wikimedia Commons
File:Vintage Texas Instruments Model SR-50A Handheld LED Electronic Calculator, Made in the USA, Price Was $109.50 in 1975 (8715012843).jpg - Wikimedia Commons
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Vintage CASIO AL-8S Electronic Calculator - Japan 1977
Old Vintage Electronic Calculator with Russian Keyboard from Soviet Union. Text on Keyboard - Russian Math Symbols Stock Photo - Image of computing, keyboard: 253685934