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The professional radio "PTSKU" was produced from 1933 by the Kazitsky plant. The professional superheterodyne radio receiver "PCCU" is intended for the equipment of large radio centers that provide commercial communication on short waves for quite considerable distances, in particular in the early 30s with the United States. In 1935, the electrical circuit and characteristics of the radio were improved. Radio PKTsU was produced until mid-1941.