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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
Sharp Model EL-8 Electronic Calculator | National Museum of American History
Vintage Casio Personal-Mini Electronic Pocket Calculator, Model CM-607, VFD, Made In Japan, Circa 1975 | Calculator design, Pocket calculators, Latest technology gadgets
Great vintage collection: the electronic calculator - Vintage Man Stuff
File:Vintage Casio Model 801 "Biolator" LED Pocket Electronic Calculator, Made in Japan, 1975 (8720348399) (2).jpg - Wikimedia Commons
Man Creates Huge Online Museum for Vintage Calculators | WIRED
Old Vintage Electronic Calculator with Russian Keyboard from Soviet Union. Text on Keyboard - Russian Math Symbols Stock Photo - Image of computing, keyboard: 253685934