Which language learning product innovation first introduced the 'spaced repetition system' (SRS) as a core feature of their commercial product?

The language learning industry has transformed dramatically over the decades, with innovative products and subscription models revolutionizing how we acquire new languages. From traditional textbooks and cassette tapes to AI-powered apps and immersive experiences, this poll tests your knowledge of a significant product innovation milestone in the language learning marketplace. Do you know which groundbreaking product changed the language learning landscape?

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