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20 agos 1829 año - 1830 First telegraph.

Descripción:

Joseph Henry constructs the first telegraph by sending electronic currents accross over a mile of wire, subsequenty activating an electromagnet, causing a bell to ring

Añadido al timeline:

Telecommunications: A History

ByPaul Duran Jimenez
20 oct 2017

fecha:

20 agos 1829 año
Ahora mismo
~ 194 years ago
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