Which calculator company first introduced the distinctive colorful slide-on protective case that became an iconic part of their brand identity in mathematics classrooms worldwide?

The design of mathematical instruments has evolved significantly over centuries, blending functionality with innovative product design. From ancient counting devices to modern calculators, these tools have shaped how we interact with numbers. This trivia question focuses on a notable product design decision in the mathematics industry that revolutionized how students and professionals approach calculation.

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Texas Instruments (TI)
Casio
HP (Hewlett-Packard)
Sharp