Which calculator brand first successfully positioned itself as an educational tool rather than just a computing device, pioneering retail partnerships with schools and universities in the 1980s-90s?

Before smartphones and computers became ubiquitous in classrooms, one calculator brand revolutionized mathematics education through innovative retail positioning and marketing. Their strategic approach to educational institutions and brilliant brand positioning transformed them from a simple electronics manufacturer to a household name synonymous with mathematics education. Test your knowledge about this influential mathematics retail success story!

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Texas Instruments (with their TI graphing calculators)
Casio (with their scientific calculator line)
HP (with their reverse Polish notation calculators)
Sharp (with their EL series calculators)