Who helped push the development of television as a mass medium yet blocked the development of FM radio for years?

Name: Who helped push the development of television as a mass medium yet blocked the development of FM radio for years?
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David Sarnoff helped push the development of television as a mass medium through his work at RCA and NBC, but he opposed the development of FM radio and blocked its progress for years, particularly the work of inventor Edwin Howard Armstrong.

Who Helped Push the Development of Television as a Mass