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English: Electrical engineer/inventor Guglielmo Marconi with the spark-gap transmitter (right) and coherer receiver (left) he used in some of his first long distance radiotelegraphy transmissions during the 1890s.
Español: El ingeniero eléctrico e inventor Guglielmo Marconi operando un aparato similar al usado por él para transmitir la primera señal no cableada a través del Atlántico.
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Electrical engineer/inventor Guglielmo Marconi with the spark-gap transmitter (right) and coherer receiver (left) he used in some of his first long distance radiotelegraphy transmissions during the 1890s.

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streymur13. apr 2019 kl. 20:33Lítil mynd av versjónini frá 13. apr 2019 kl. 20:333.000 × 1.849 (1,06 MB)Alex MicrobeHigher Resolution
24. mai 2009 kl. 20:47Lítil mynd av versjónini frá 24. mai 2009 kl. 20:47600 × 379 (33 KB)Lobo== Sumario == {{Information |Description={{en|1=Electrical engineer/inventor Guglielmo Marconi operating apparatus similar to that used by him to transmit first wireless signal across Atlantic.}} {{es|1=El ingeniero eléctrico e in

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