Briely stated, the present invention provides a bit assembley for {HEAD ~ a rotary drill} having, {TAIL ~ a source} of fluid under pressure 
having
Briely stated , the present invention provides a bit assembley for { HEAD ~ a rotary drill } having , { TAIL ~ a source } of fluid under pressure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH