In 1895, Guglielmo Marconi used Morse code, a telegraph key, and his knowledge of Hertzian waves to successfully send the first wireless messages.

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Marconi, utilizing his understanding of electromagnetic waves (Hertzian waves), Morse code, and a telegraph key, was able to send the first wireless messages in 1895, marking the beginning of wireless communication technology.

In 1895, Guglielmo Marconi Used Morse Code, a Telegraph Key