30 janv. 1939 - Rogers Batteryless 1939
Description:
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.Ajouté au bande de temps:
Date:
30 janv. 1939
Maintenaint
~ Il y a 86 ans