414 / | HD | MATERIAL OR ARTICLE HANDLING |
467 | DF | SELF-LOADING OR UNLOADING VEHICLES {8} |
539 | DF | .~ Loading or unloading by other carrier or mover means, and the load movement thereof {3} |
540 | DF | .~.~ Raising or lowering of load or load holder includes vertical, rectilinear movement {2} |
545 | .~.~.~ Carrier comprises movable component of load-receiving portion (e.g., tailgate, section of floor, etc.) |