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File:Vintage Gillette "GPA" Red LED Pocket Electronic Calculator, Model PC-1, Made by Sinclair in England for Gillette, Circa 1974 (8728926960).jpg - Wikimedia Commons
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Vintage green VFD calculator fonts: Sharp QT-8D (1969), PC-1001 (1973), EL-811 (1972), PC-1200 (1977) : r/calculators
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Casio numeric keypad calculator Connect to a PC to improve telework efficiency mini just type 12 digits MZ-20SR-N - Walmart.com
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