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1 janv. 1888 - Battery Systems

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 unit's own battery.

Ajouté au bande de temps:

History of Phones

ByOsasere Guobadia
24 oct. 2018

Date:

1 janv. 1888
Maintenaint
~ Il y a 136 ans

Les images:

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