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File:Vintage Texas Instruments Model SR-10 Pocket LED Calculator, First of a Line of TI "Slide Rule" Models, Sealed Battery, Price - 149.95 USD, Circa 1972 (14592862578).jpg - Wikimedia Commons
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Texas Instruments model SR-10 calculator | National Museum of American History
File:Texas Instruments SR-10.JPG - Wikipedia
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Vintage Texas Instruments Electronic Pocket Calculator With AC Adapter, Model SR-51-II, 10-Digit LED Display, Made In USA, Circa 1976 | Pocket calculators, Calculator, Sin cos tan