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Radio "R-310" (Watch) has been produced since 1954. Designed for direction finding. The range 1.5 ... 25.0 MHz, is divided into 6 subranges. 2 conversions. 16 bulbs. Telephone, telegraph. Sensitivity 4 and 1 µV. Power from the network and from batteries. Dimensions 520x370x362 mm. Weight 29 kg. Since 1958, the upgraded R-310M receiver (Dozor-M) was produced in the same design as described, but with 15 lamps and another breakdown of the first two subranges.