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Ferroresonant voltage stabilizer "Sabit" (FSN-200) allegedly since 1962 was produced by the Baku plant Elektrobytpribor. The stabilizer is designed to maintain the output voltage of 220 volts, when it changes in the network from 154 to 253 volts. Maximum load power 200 watts. The mass of the device is 8 kg. Presumably, since 1968, the plant produced a stabilizer of similar design and design, under the name "Sabit-2" (model 2).