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Around the early 1920s, commercial radio broadcasting was released to the public when the US broadcasted KDKA's presidential election in November 1920.
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The first successful Demonstration of a fully electronic Television was in 1927 by Philo Farnsworth. Later in 1932 commercial Cathode ray tube televisions were manufactured in Germany by Telefunken.
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The first electric guitar was invented in 1931 by George Beauchamp. He called it his "frying pan" because of the shape. He and his coworker Paul Barth, they got the product produced by Adolph Rickenbacker's company.
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The FM radio was invented by American engineer
Edwin Armstrong, and the FM radio was patented in 1933. The AM radio was has been out since 1906, but FM radio allows for better sound quality with a wider bandwidth and less static noise from storms.