Which calculator company first successfully marketed their product as essential for mathematics education, launching a product that became standard in classrooms worldwide in the 1970s?

In the world of mathematics education, calculator companies have dramatically shaped how we teach and learn. Their product launches, marketing strategies, and positioning have influenced generations of students and professionals. This trivia question explores a pivotal moment in the history of mathematical computing tools that changed classroom dynamics forever.

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Texas Instruments (with the TI-30)
Casio (with the fx-7000G)
Hewlett-Packard (with the HP-35)
Sharp (with the EL-8)