| 414 / | HD | MATERIAL OR ARTICLE HANDLING |
| 467 | DF | SELF-LOADING OR UNLOADING VEHICLES {8} |
| 507 | DF | .~ Conveyor {12} |
| 529 | | .~.~ Load-engaging roller or rollerway {4} |
| 530 | DF | .~.~.~> With means for locking roller against rotation |
| 531 | DF | .~.~.~> With separate means movable vertically between load supporting and retracted positions |
| 532 | DF | .~.~.~> Shiftably or removably supported on vehicle {2} |
| 536 | DF | .~.~.~> With means for preventing movement of load relative thereto |