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Civilian defense. War Emergency Radio Service. These three War Emergency Radio Service transmitter-receivers tuned to different wave lengths keep this Civilian Defense control center in touch with three different channels of communication. The set being operated maintains contact with state and city police and fire departments. The other two are used for communicating with sub-control centers, hospitals, and mobile field units

Civilian defense. War Emergency Radio Service. These three War Emergen...

Public domain photograph of indoor, interior activity, America in the 1930s, free to use, no copyright restrictions image - Picryl description