Which calculator brand first introduced the distinctive slide-on hard plastic cover that became an iconic packaging design element for scientific calculators in the 1970s?

Test your knowledge about the evolution of mathematical tools and their iconic packaging! Throughout history, mathematical instruments and calculators have featured distinctive branding and packaging that often reflected the technological innovations of their time. This question focuses on a groundbreaking product that revolutionized mathematics education with its distinctive packaging design.

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Texas Instruments (with the TI-30)
Casio (with the fx-10)
Hewlett-Packard (with the HP-35)
Sharp (with the EL-8)