The unit may also be provided with {TAIL ~ a traverse motor} for driving the coring bit into {HEAD ~ an object} being cored, and for withdrawing the coring bit once a core has been formed 
The unit may also be provided with { TAIL ~ a traverse motor } for driving the coring bit into { HEAD ~ an object } being cored , and for withdrawing the coring bit once a core has been formed
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH