What The History Podcast - On 20 October, 1907, Lee de Forest patented the Audion vacuum tube. His invention became the standard for transmission and receiving of live radio broadcasts and was
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National Association for Music Education - In 1907 the 1st radio broadcast of a musical composition aired. Celebrate #MIOSM by listening to the radio. #NCGME #MusicTheSoundOfMyHeart nafme.org/MIOSM | Facebook
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