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