| 451 / | HD | ABRADING |
| 1 | DF | PRECISION DEVICE OR PROCESS - OR WITH CONDITION RESPONSIVE CONTROL {7} |
| 11 | DF | .~ With feeding of tool or work holder {6} |
| 24 | | .~.~ Hydraulically driven {2} |
| 25 | DF | .~.~.~> Sizing gauge controlled |
| 26 | DF | .~.~.~> Control means near and parallel to the abrader |