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16 oct 1874 año - Advances on the research for THE HARMONIC TELEGRAPH

Descripción:

By October 1874, Bell's research had progressed enough to talk with his attorney Gardiner Greene Hubbard, about the possibility of a multiple telegraph. Hubbard instantly saw the potential and gave Bell the financial help he needed.

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Byjavier del rio tarque
3 dic 2018

fecha:

16 oct 1874 año
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~ 149 years ago

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