1 янв 1906 г. - Audion triode vacuum tube Invented
Описание:
an electronic valve that could amplify weak electrical signals. By 1915, it was in use in long-distance telephone circuits that made conversations between New York and San Francisco practical.Добавлено на ленту времени:
Дата:
1 янв 1906 г.
Сейчас
~ 119 г назад