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File:Vintage Sharp Elsi Mate Pocket LED Calculator, Model EL-500, Made in Japan, Circa 1977 (9258052602).jpg - Wikimedia Commons
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LED Calculator. Calculation of Current-Limiting Resistors for a Single LED and LED Arrays • Electrical, RF and Electronics Calculators • Online Unit Converters
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You Can Power a Calculator With Some LEDs | WIRED
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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Mark-->'s Early LED Calculators
