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Un mecanismo de cambio de marcha para bicicletas a motor y motocicletas con dos o más marchas que pueden intercalarse por el conductor, caracaterizado porque la marcha pequeña contiene un acoplamiento de rueda libre, al paso que la marcha grande o las marchas más grandes pueden intercalarse a elección a través de un acoplamiento embragable y desembragable a voluntad, por ejemplo un acoplamiento dilatable que en forma en sí conocida salva el acoplamiento de rueda libre.
ES0200460A1950-12-071951-11-13Un mecanismo de cambio de marcha para bicicletas a motor
ExpiredES200460A1
(es)