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Casio FX-991DE X Scientific Calculator with Natural Display (only German Language)
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Casio FX-991DE X Engineering calculator Black Display (digits): 12 solar-powered, battery-powered (W x H x D) 77 x 11 x | Conrad.com
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Casio FX-991DE Scientific Calculator Plus Two Way Power Solar Battery Silver | eBay
Casio FX-991DE X Scientific Calculator with Natural Display (only German Language)
Casio FX-991DE X Scientific Calculator with Natural Display (only German Language)