![TI-Planet al Twitter: "An interesting history of calculators by @EdTech_K12, from adding machines to graphing calculators. Note the 1st color graphing calculator isn't the 2011 fx-CG20. Still by Casio but long before, TI-Planet al Twitter: "An interesting history of calculators by @EdTech_K12, from adding machines to graphing calculators. Note the 1st color graphing calculator isn't the 2011 fx-CG20. Still by Casio but long before,](https://pbs.twimg.com/media/EiXe69AXcAEmzFF.jpg:large)
TI-Planet al Twitter: "An interesting history of calculators by @EdTech_K12, from adding machines to graphing calculators. Note the 1st color graphing calculator isn't the 2011 fx-CG20. Still by Casio but long before,
THREE CASIO FX-7700GB GRAPHIC SCIENTIFIC CALCULATERS AND ONE CASIO CFX-9800G COLOUR GRAPHIC SCIENTIF
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