Parts and elements of machines; parts and elements of machine installations, i.e. spoke handwheels, discs and arms; bushings [parts of machine]; bushings for striker [parts of machine]; eccentric bushings [parts of machine]; pistons [parts of machine]; spring plungers [parts of machine]; positioning plungers [parts of machine]; positioning plungers with rest position [parts of machine]; spring plungers for threaded bolts and their supports [parts of machine]; threaded spring plungers [parts o...