Which calculator company first introduced the slide case packaging design that became an industry standard for graphing calculators in the 1990s?

Calculator brands have been competing for decades in classrooms, offices, and engineering labs. While many brands have come and gone, a few have maintained remarkable brand loyalty among mathematicians, engineers, and students. This trivia question explores how one company revolutionized the calculator market with innovative packaging that changed how we think about mathematical tools. Test your knowledge about the intersection of consumer products and mathematics!

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Texas Instruments
Casio
Hewlett-Packard
Sharp