Two optical signals of reflected light emanate from each of the four inspection regions and are directed toward {TAIL ~ two optical cameras}, with the two optical signals from each of {HEAD ~ the optical regions} being at different viewing angles and preferably from a single focal point 
Two optical signals of reflected light emanate from each of the four inspection regions and are directed toward { TAIL ~ two optical cameras } , with the two optical signals from each of { HEAD ~ the optical regions } being at different viewing angles and preferably from a single focal point
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH