Why the TI Graphing Calculator Ruled Your Classroom — mashable.com

Raise your hand if you have ever used a Texas Instruments (TI) graphing calculator. The mathematic and scientific tool is easily the most popular name in modern calculators. If you scan the list of Amazon's bestselling graphing calculators, you'll see that TI models usually take the top three spots. But how has one brand managed to keep such a hold on the calculator industry? Let's start from the beginning.

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