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Casio 9850 series - Wikipedia
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Casio CFX-200 from 1983. Have... - Interesting Engineering | Facebook
Casio FX- 260 Solar II Scientific Calculator, LCD Display, Black - Walmart.com
User manual Casio CFX-9850GB Plus (English - 486 pages)
Casio CFX-9850G Handheld Electronic Calculator | National Museum of American History
