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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
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Which is a better calculator for an engineering student: Texas Instruments TI-36X Pro or Casio 991EX? - Quora
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Casio FX-991DE CW ClassWiz Technical Scientific Calculator, German Menu Guide : Amazon.de: Stationery & Office Supplies
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