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I bought this Casio fx-CG20 from a local store for 15$. I can clearly say its a huge improvement after my grandfathers sld-767. : r/calculators
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Casio fx - CG 20 Taschenrechner/ Grafikrechner mit hochauflösendem Farbdisplay | Acquisti Online su eBay
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Casio FX-CG50, calcolatrice grafica con display a colori ad alta risoluzione (con Scatola Di Cartone) : Amazon.it: Cancelleria e prodotti per ufficio
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