And {HEAD ~ the covers} can be formed with an integral transition portion at one end, cut to length at the other end, and spliced at {TAIL ~ a butt joint} to make a section, as shown in FIG 20 and 24 
And { HEAD ~ the covers } can be formed with an integral transition portion at one end , cut to length at the other end , and spliced at { TAIL ~ a butt joint } to make a section , as shown in FIG 20 and 24
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH