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