74 / | HD | MACHINE ELEMENT OR MECHANISM |
469 | DF | CONTROL LEVER AND LINKAGE SYSTEMS {8} |
479.01 | DF | .~ Multiple controlling elements for single controlled element {8} |
490.07 | DF | .~.~ Power elements as controlling elements {3} |
490.09 | .~.~.~ Planar surface with orthogonal movement only |