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Researching of a MULTIPLE TELEGRAPH (20 dic 1865 año – 9 oct 1874 año)

Descripción:

During his early years Graham spend his knowledge about sound and music, looking for a way to transmit multiple messages over the same wire at the same time.

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Byjavier del rio tarque
3 dic 2018

fecha:

20 dic 1865 año
9 oct 1874 año
~ 8 years and 9 months
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