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Radio PD-4 "from the middle of 1936 produced the Leningrad Apparatus Plant. Kazitsky. Radio "PD-4" is designed to receive radio stations operating by telephone and telegraph in the range from 200 to 20,000 meters (1500 ... 15 kHz). The entire wavelength range is overlapped by connecting interchangeable coils. The receiver is assembled on four battery radio tubes. More information about the radio "PD-4" and its technical parameters in the instructions.