How did WWII radio communications work? Did each unit (land/air/sea) have a separate frequency, or could you communicate with all random units, ships, and planes that were close? - Quora
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Amazon.com: Vintage WWII Radio Films DVD: Radio & Mass Communication in World War Two (from the World War WW2 Collection) : Ganz (William J.) Co., Handy (Jam) Organization: Movies & TV
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