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File:Vintage Texas Instruments Datamath Pocket LED Calculator, Model TI-2500, Version 3, Made in the USA, Circa 1973 (9288612296).jpg - Wikimedia Commons
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File:Vintage Texas Instruments Datamath Pocket LED Calculator, Model TI-2500, Version 3, Made in the USA, Circa 1973 (41029101670).jpg - Wikimedia Commons
Texas Instruments TI-2500B (Datamath) Handheld Electronic Calculator | National Museum of American History
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File:Texas Instruments TI-2500 Datamath Version 1 showing display powered on.jpg - Wikimedia Commons
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Texas Instruments TI-2500 DataMath Red LED Calculator w/Pouch1972 Works + Extras | Basic calculator, Red led, Calculator
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