When was the first transatlantic radio signal sent?
In 1901, Guglielmo Marconi received the first transatlantic radio signal, the Morse code letter "S," sent from England to Newfoundland.
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Guglielmo Marconi Facts
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Did Tesla or Marconi invent the radio?
Guglielmo Marconi is usually credited with inventing the radio, but a 1943 US Supreme Court decision invalidated key parts of his patent, recognizing earlier work by others including Nikola Tesla.