Which was the first major technological development in the rise of the electronic media?

Name: Which was the first major technological development in the rise of the electronic media?
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Radio was the first major technological development in the rise of electronic media, with the first commercial broadcast station, KDKA, airing in 1920. TV and the Internet came later, and palm pilots were a personal electronic device rather than a major technological development in the media industry.

Which Was the First Major Technological Development in the Rise