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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
Eddie's Math and Calculator Blog: Comparison: Casio fx-991EX Classwiz Vs Sharp EL-W516T
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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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Casio FX-991ES Plus Battery Replacement - iFixit Repair Guide
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Kalkulátor Casio FX-991CEX
