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CASIO fx-82 SUPER. I bought it in 1.992, use it in college, at the university and 20 years more at the office. Never changed battery and im not going to retire it
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Amazon.com : Casio Super Fx-3650p Programmable Scientific Calculator with 2-line Natural Textbook Display Multi Replay Function Silver : Graphing Calculators : Office Products
Casio® FX-115ESPLUS Advanced Scientific Calculator, 10-Digit Natural Textbook Display | National Everything Wholesale
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Amazon.com : Casio Super Fx-3650p Programmable Scientific Calculator with 2-line Natural Textbook Display Multi Replay Function Silver : Graphing Calculators : Office Products
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