Letter from the Czech Republic — the calculator that worked on two AA batteries for more than 30 years — : SHARP Blog
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Sharp EL-825
Vintage Sharp EL-5100S Scientific Calculator. and 50 similar items
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File:Vintage Sharp Scientific Pocket Computer-Calculator EL-5500II With Printer and Cassette Interface CE-129F, Made in Japan, Circa 1980s (12243230873).jpg - Wikimedia Commons