In a record player, a turntable is rotatably mounted on a base, and a rotor structure, such as an annular magnet, is mounted on the turntable and cooperates with a stator aperture mounted on the base to cause the turntable to rotate. The annular magnet is preferably a rubber magnet formed by molding...http://www.google.fr/patents/US4194743?utm_source=gb-gplus-shareBrevet US4194743 - Record player
