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first US radio station (KDKA)
first airing in Pittsburgh the first US radio station naded the KDKA was made in 1920. back then your average radio would be around $150 so not many people heard the radio at first. -
Television
First called the "Image Dissector" the television was made in 1927 by Philo Farnsworth however 2 years later in 1929 an inventor by the name of Vladimir Zworykin made an improved system of TV.