This device also makes possible measurement of the gap for {HEAD ~ the profile base} indirectly on {TAIL ~ line} 
indirectly on
This device also makes possible measurement of the gap for { HEAD ~ the profile base } indirectly on { TAIL ~ line }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL