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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What are some useful calculator (Casio fx-991ES) hacks? - Quora
Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products
Not working. No display. Better also changed. what should I do? - Casio FX-991ES Plus - iFixit
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Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products
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Why does the German version of the Casio fx-991EX, the fx-991DE X, have more functions than the US version? : r/calculators
