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30 dez 1887 ano - Hammond V. Hayes

Descrição:

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.

Adicionado na linha do tempo:

click for descriptions/PHONE TIMLINE

ByJasun Foley
23 out 2018
0
0
420

Data:

30 dez 1887 ano
Agora
~ 137 years ago
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