A second flow of the pressurized fluid is directed upwardly to remove the dust and cutting {HEAD ~ cones} from {TAIL ~ the drill hole} 
from
A second flow of the pressurized fluid is directed upwardly to remove the dust and cutting { HEAD ~ cones } from { TAIL ~ the drill hole }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL