We ran across this excellent 7 minute film from 1936 showing the manufacturing of radios by Philips in Czechoslovakia. We don't understand the narration; however, this doesn't detract from the film.
Be sure to check out:
WWII Film - Hallicrafters: Voice of Victory - SCR-299
US Army Signal Corps training film for the SCR-694, BC-1306 field radio
1944 US Navy Training Film - Radio Operator Training - Technique Of Hand Sending CW with a straight key
Army Morse Code Training Film 1966