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Casio fx-991ES – Wikipedia
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Casio fx-991ex vs. fx-991es, fx-570es and fx-115es (PLUS) scientific calculators - Numericana
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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
Casio FX-991EX and FX-300ES
Got ahold of a Casio fx-991ex and CG-50 to match my Classpad II. I'm really impressed with them but there is something about the fx-991ex... (see comments) : r/calculators
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fx-991EX | CASIO
How is the FX-991EX better than the FX-991ES Plus? - Quora
Casio Launches New fx-991EX Scientific Calculator With Spreadsheet Function
