Amazon.com : (CASIO) Scientific Calculator (FX-991ESPLUS) : Office Products
fx-991EX | ClassWiz | Non programmable | scientific calculator | CASIO
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Not working. No display. Better also changed. what should I do? - Casio FX-991ES Plus - iFixit
calculator not working. i accidentally dropped it and its not working anymore. its the citizen sr-270n : r/calculators
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My FX-991EX seems to be stuck. It's not taking any inputs and not responding to reset button. : r/calculators
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