Thus, the low thermal expansion sealing ring 60,60 and {HEAD ~ the plurality} of {TAIL ~ supporting members} 70,70 used to support the sealing ring 60,60 reduce the unwanted clearance C,C, improve efficiency and effectiveness 
of
Thus , the low thermal expansion sealing ring 60,60 and { HEAD ~ the plurality } of { TAIL ~ supporting members } 70,70 used to support the sealing ring 60,60 reduce the unwanted clearance C , C , improve efficiency and effectiveness
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH