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30 ene 1939 año - Rogers Batteryless 1939

Descripción:

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.

Añadido al timeline:

1920 Timeline

Byjacob hempel
31 oct 2018
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0
373

fecha:

30 ene 1939 año
Ahora mismo
~ 86 years ago

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