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Amazon.com : Casio FX-991ES Plus Scientific Calculator Fx 991 Es - New & Sealed ship to world wide : Office Products
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Casio fx-991ES Plus giving me weird results, is it faulty or can there be a setting I'm missing? : r/calculators
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Amazon.com : Upgraded 991ES Plus Scientific Calculator, ROATEE Professional Scientific Calculators with Erasable LCD Writing Tablet, Solar and Battery Dual Power,Desktop Calculator with Notepad for Office, School : Office Products
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