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30 dic 1887 año - Hammond V. Hayes

Descripción:

Common battery system developed by Hammond V. Hayes, allows one central battery to power all telephones on an exchange, rather than relying on each units own battery.

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click for descriptions/PHONE TIMLINE

ByJasun Foley
23 oct 2018
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fecha:

30 dic 1887 año
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~ 137 years ago
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