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| 1899 |
| | Italian inventor Guglielmo Marconi succeeds in transmitting a wireless telegraph message across the English Channel | |
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| 1899 |
| | Marconi equips two ships to send radio reports to New York on the progress of the yachts racing for the America's Cup | |
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| 1901 |
| | Guglielmo Marconi transmits a radio message in Morse code 2100 miles, from Poldhu in Cornwall to St John's in Newfoundland | |
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| 1907 |
| | US inventor Lee De Forest patents the Audion, a sensitive vacuum-tube radio receiver | |
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| 1910 |
| | Lee De Forest broadcasts Enrico Caruso live from the Metropolitan Opera House in New York, but with mixed success owing to the poor quality | |
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| 1910 |
| | Telegraph messages lead to the arrest of Dr Crippen and his mistress Ethel Le Neve in mid-Atlantic | |
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| 1913 |
| | The US navy begins transmitting by radio a regular time signal, much used by the nation's watchmakers and menders. | |
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| 1915 |
| | Alexander Graham Bell again summons his assistant Thomas Watson (as in 1876), but this time he is in New York and Watson in San Francisco | |
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| 1915 |
| | Radiotelephone messages are transmitted from Arlington in Virginia to the Eiffel Tower in Paris | |
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| 1926 |
| | John Logie Baird gives the world's first demonstration of television to a group assembled in his attic rooms in London | |
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