The apparatus further includes {HEAD ~ a camera} arranged to receive {TAIL ~ an image} of the illuminated interior of the hole from the telecentric lens system 
arranged to receive
The apparatus further includes { HEAD ~ a camera } arranged to receive { TAIL ~ an image } of the illuminated interior of the hole from the telecentric lens system
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH