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Tifflotechnical cassette stereo tape recorder "Russ P-310S-4T" has been producing Ryazan instrument factory since I-1994. This is a four-track tape recorder designed to play MF2-4 phonograms (talking book) at a speed of 2.38 cm / s and musical phonograms at a speed of 4.76 cm / s through a loudspeaker and loudspeaker. Produced a model for people with impaired vision. At a speed of 4.76 corresponds to the parameters of the recorder "Rus M-310S".