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The negotiating device loud-speaking "UPG" since 1980 produced an experimental plant NPO "Wave". The device is intended for two-way loud-speaking wired communication between two subscribers at a distance of up to 1000 meters. Nominal output power 125 mW. The operating frequency range is 450 ... 3000 Hz. Dimensions of one device 125x75x56 mm. Weight 450 grams.
Based on information from collection of Valery Khartchenko