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Transmitter - Wikipedia
The Walter Day Collection - 0003 - December 12, 1901 - Marconi sends first radio transmission across the Atlantic
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History of radio - Wikipedia
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Invention of radio - Wikipedia
Marconi sends transatlantic wireless message, January 19, 1903 - EDN
Invention of radio - Wikipedia
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History of radio - Wikipedia
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Guglielmo Marconi is credited with the first radio transmission in 1896 but he didn't transmit voice just a signal. Radio voice came along in the early 1900s. The actual credit for the
What Is Radio Transmission?
File:Marconi's first radio transmitter.jpg - Wikimedia Commons