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Casio FX-991DE X ClassWiz Scientific Calculator with Natural Display, Schwarz, Technisch-Wissenschaftlich : Amazon.de: Bürobedarf & Schreibwaren
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Calcuso Standard Package: Casio FX-991 DE X Technical-Scientific Calculator + WYNGS Protective Case Black + CALCUSO Book + Extended Warranty by Calcuso: Amazon.de: Stationery & Office Supplies
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