In normal operation, {HEAD ~ an inner oblique surface} 46 of {TAIL ~ the seal cover} 24 meets a corresponding inner oblique surface 47 on the lip 37 of the vessel 31 
of
In normal operation , { HEAD ~ an inner oblique surface } 46 of { TAIL ~ the seal cover } 24 meets a corresponding inner oblique surface 47 on the lip 37 of the vessel 31
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH