 The T37 radio receiver, released two years later, won second prize at the 1938 Technology of Communication exhibition.In October 1941 the plant evacuated to Perm, but technicians and engineers were able to return early the following year to reconstruct the plant, which re-opened in May, producing mine-detectors, horn loudspeakers, and dynamic microphones.In 1943 the company developed a crystal loudspeaker and won first prize in a national competition.