(Unsichtbare Brücken)

Content: In the broadcasting center of a radio station, visitors are informed in a kind of educational course about how "electric waves" are generated and how they are converted into sounds that can then be heard on the radio.

Countries:

Germany

Genres:

Documentary

Runtime:

40 minutes

Year:

1932

Directors:

Hans Fritz Wilhelm

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Production companies:

Commerz-Film AG (Berlin)

Actors:

Crews:

Director

Music

Director of Photography