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CASIO FX-991EX Advanced Scientific Calculator ClassWiz White Case Solar Powered | eBay
CASIO fx-991EX – Casio
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Casio FX-991EX Scientific Calculator FX 991 EX Classwiz 552 function New in Box | eBay
Casio fx-991EX – Shomagom
Original CASIO FX 991EX Advanced Scientific Calculator 552 Functions Engineering Students High School Lab Office Solar Battery|Calculators| - AliExpress