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Portable transistor radio 4th grade "Almaz-401" from 1971 produced the Leningrad plant "Radiopribor". RP "Almaz-401" was created on the basis of the serial model of the radio "Almaz" and differs from it only in the external design and minor changes in the design and electrical circuit. All of its acoustic and electrical parameters are similar to the basic radio "Almaz".