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Player "Sonata-Mini" was experimentally released in 1985 by Velikoluksky software "Radiopribor". The player is intended for playing back phonograms from MK-60 type cassettes to small-sized headphones. There is no information on the player, but on its basis, since 1987, the plant has produced the Sonata P-421C tape player.
Based on information from collection of Valery Khartchenko