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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 (9304906070).jpg - Wikimedia Commons

The History Of The Calculator: When was the Calculator First Invented?

Mechanical calculator - Wikipedia

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Mark-->'s Early LED Calculators

Hand held Calculators

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File:Vintage Texas Instruments TI-1250 Red LED Pocket Electronic Calculator, Made in USA, Circa 1975 - Price Was 19.95 USD (10649611933).jpg - Wikimedia Commons

The History Of The Calculator

Vintage Litronix 1600 Electronic Pocket Calculator, Made In Malaysia, Red LED Display, Circa 1970s

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