Casio College FX-80 pocket scientific electronic calculator, circa News Photo - Getty Images

Virtual Museum of Calculators

Casio College FX-80 pocket scientific electronic calculator, circa News Photo - Getty Images

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(CASIO) Scientific Calculator (FX-991ESPLUS) : Office Products

VINTAGE 80'S CASIO FX-702P Programmable Calculator Pocket PC Computer w/ Case $89.00 - PicClick

Casio College FX-80 pocket scientific electronic calculator, circa News Photo - Getty Images

(CASIO) Scientific Calculator (FX-991ESPLUS) : Office Products

Virtual Museum of Calculators

Casio College FX-80 pocket scientific electronic calculator, circa News Photo - Getty Images