| 180 / | HD | MOTOR VEHICLES |
| 7.1 | DF | SPECIAL DRIVING DEVICE {6} |
| 9 | DF | .~ Portable track {2} |
| 9.1 | DF | .~.~ Endless, flexible {12} |
| 9.5 | DF | .~.~.~ Track support mounted for vertical movement {2} |
| 9.54 | DF | .~.~.~.~ With spring {2} |
| 9.58 | DF | .~.~.~.~.~ Leaf or torsion spring {1} |
| 9.6 | ![]() | .~.~.~.~.~.~ Transversely extending |