| 172 / | HD | EARTH WORKING |
| 518 | DF | ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30} |
| 579 | ![]() | .~ Plural groups of disks {5} |
| 580 | DF | .~.~> Power operated actuator |
| 581 | DF | .~.~> Groups changeable to different types of arrangements |
| 582 | DF | .~.~> With independent lateral adjustment |
| 583 | DF | .~.~> Vertically adjustable group |
| 584 | DF | .~.~> Horizontally angularly adjustable group {9} |