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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
Texas Instruments TI-51-III | IT History Society
DAVES OLD COMPUTERS - Calculators and Slide Rules
TI Texas Instruments SR-51-II Calculator Case Manual | eBay
Peter's z80.eu site blog - Texas Instruments SR-51-II ... a more complex calculator than you think
SR-51-II User's Guide by Texas Instruments [1976] : Texas Instruments : Free Download, Borrow, and Streaming : Internet Archive
TI CALCULATOR HISTORY
TI SR-51-II
Texas Instruments SR-51-II Handheld Electronic Calculator | National Museum of American History