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30 déc. 1887 - Hammond V. Hayes

Description:

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.

Ajouté au bande de temps:

click for descriptions/PHONE TIMLINE

ByJasun Foley
23 oct. 2018
0
0
420

Date:

30 déc. 1887
Maintenaint
~ Il y a 137 ans
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