30 янв 1939 г. - Rogers Batteryless 1939
Описание:
The line operated vacuum tube receiver was invented in 1925 by Edward S Rogers. The unit operated with 5 Rogers Battery Eliminator power unit. This unit was later marketed for $120 as "type 120". It was the first wireless radio and was very portable.Добавлено на ленту времени:
Дата:
30 янв 1939 г.
Сейчас
~ 86 г назад