As described above, the cover 43 is provided over the entire circumferential end edge with a base attachment piece {HEAD ~ 432 U} shaped in {TAIL ~ cross section} 
shaped in
As described above , the cover 43 is provided over the entire circumferential end edge with a base attachment piece { HEAD ~ 432 U } shaped in { TAIL ~ cross section }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL