Which groundbreaking product design feature did Thomas Edison introduce to phonographs in 1888 that revolutionized the music industry and influenced product design for decades?

Thomas Edison is known as one of history's greatest inventors, with over 1,000 patents to his name. His innovations transformed everyday life and created entire industries. While the lightbulb is his most famous invention, Edison's laboratory developed numerous products that revolutionized product design philosophy. This trivia explores one of Edison's lesser-known but highly influential product design decisions that changed how we interact with technology.

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The wax cylinder recording medium
The spring-powered motor (eliminating hand-cranking)
The ornamental horn speaker design
The diamond stylus for playback