History, 01.08.2019 02:30, josefaarancibia5

In the 1920s, the development of practical radio communication was furthered by 1. enthusiasts who built their own sets at home. 2. the theory of modulation. 3. all these answers are correct. 4. both the theory of modulation and the use of vacuum tubes. 5. the use of vacuum tubes.

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In the 1920s, the development of practical radio communication was furthered by 1. enthusiasts who b...