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The Leningrad subscriber loudspeaker has been produced since 1987 by Leningrad PO Box 537 and possibly another plant. The small-sized souvenir subscriber loudspeaker "Leningrad" is designed to operate on radio networks with a voltage of 30 V. The frequency range is 200 ... 4000 Hz. Dimensions 170x60x22 mm. Weight 350 g.