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Casio - FX-82MS. I bought it in high school, used it in University and now on my 4th year as a Professional Accountant. Haven't changed the battery once. : r/BuyItForLife
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Casio FX-87DEPLUS-2 Technisch wissenschaftlicher Rechner Schwarz Display (Stellen): 12 solarbetrieben, batteriebetrieben kaufen
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