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30 Dez 1887 Jahr - Hammond V. Hayes

Beschreibung:

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 Okt 2018
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0
420

Datum:

30 Dez 1887 Jahr
Jetzt
~ 137 years ago
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