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Marconi discovered electromagnetic radiation-now generally known as radio waves, at the time more commonly called "Hertzian waves" or "aetheric waves".

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10y ago
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10y ago

Long-distance telegraphy. Please see his article on wikipedia for more information.

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10y ago

Long-distance telegraphy.

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13y ago

the radio

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Q: What was Guglielmo Marconi's most important invention?
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