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30 dic 1887 anni - Hammond V. Hayes

Descrizione:

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.

Aggiunto al nastro di tempo:

click for descriptions/PHONE TIMLINE

ByJasun Foley
23 ott 2018
0
0
420

Data:

30 dic 1887 anni
Adesso
~ 137 years ago
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