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Telegraphy.

Telegraphy is a form of long-distance communication that uses a device known as a telegraph to transmit electrical signals over wires. The telegraph sends a series of pulses and taps electronically over the length of a wire to another device. The...

Salem Press Encyclopedia of Science, 2019. 2p.

12. The Marconi scandal [1962]

14. Telling the world [1933]

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