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mechanical device for the variation of the length of an element (crank, connecting rod or barbell) mobile a quadrilateral structured, or a manovellismo and quadrilateral structuredin particular, the rudder pedals of a bicycle
mechanical device for the variation of the length of an element (crank, connecting rod or barbell) mobile a quadrilateral structured, or a manovellismo and quadrilateral structuredin particular, the rudder pedals of a bicycle