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jan 1, 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.

Added to timeline:

History of Phones

ByOsasere Guobadia
24 Oct 2018

Date:

jan 1, 1888
Now
~ 136 years ago

Images:

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