| 175 / | HD | BORING OR PENETRATING THE EARTH |
| 207 | DF | WITH ABOVE-GROUND MEANS FOR HANDLING DRILLING FLUID OR CUTTING {9} |
| 209 | ![]() | .~ Fluid or cuttings directing or receiving means engaging bore entrance {2} |
| 210 | DF | .~.~> Anchored to bore wall |
| 211 | DF | .~.~> Axially supported by tool shaft |