33
/ru/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
November 1, 2025
1959198
161802
2
Public Timelines
FAQ Получить премиум

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:

Дата:

30 дек 1887 г.
Сейчас
~ 137 г назад