Casio FX82 calculator I bought in 1982 at the age of 15. Used it throughout school, my apprenticeship and work as a draughtsman. Don't use it much now but it still works
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CASIO FX 15 | eBay
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Casio - fx-15 - - Vintage calculator - Casio fx15 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
CASIO fx-991ZA PLUS II - 15 Converting Decimals to Fractions - YouTube