Which of these calculator companies merged with Hewlett-Packard in 2001, leading to the integration of their graphing calculator technology into HP's educational products division?

Throughout history, companies that produce mathematical tools, calculators, and educational software have undergone significant brand transformations. Some mergers created powerful educational technology giants, while others disappeared entirely. This poll tests your knowledge of the business side of mathematical product development and how certain brands positioned themselves in the educational market.

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Calculated Industries
Texas Instruments
Casio
Indigo (formerly known as Pacific Tech)