Which calculator company first successfully marketed affordable scientific calculators to students, creating a new education market segment in the 1970s?

Before computers dominated every desk, calculators represented a major retail innovation that transformed how mathematics was taught, learned, and practiced. From mechanical adding machines to electronic pocket calculators, these devices sparked intense brand competition and loyalty. This trivia question explores a pivotal moment in calculator retail history that changed mathematics education forever.

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Texas Instruments, with their TI-30 model that sold for under $25 in 1976
Hewlett-Packard, with their HP-35 model marketed specifically to schools in 1974
Casio, with their fx-10 'student scientific' calculator launched in 1975
Sharp, with their EL-8 affordable classroom calculator released in 1973