{TAIL ~ A traverse mechanism} may be provided to allow the coring bit to be advanced into {HEAD ~ a pipe} being cored 
{ TAIL ~ A traverse mechanism } may be provided to allow the coring bit to be advanced into { HEAD ~ a pipe } being cored
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH