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30 дек 1887 г. - Hammond V. Hayes

Описание:

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.

Добавлено на ленту времени:

click for descriptions/PHONE TIMLINE

ByJasun Foley
23 окт 2018
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0
420

Дата:

30 дек 1887 г.
Сейчас
~ 137 г назад
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