In one arrangement, each channel section can include {HEAD ~ a flange} along {TAIL ~ both sides} thereof, the connection mechanism being provided on each flange 
along
In one arrangement , each channel section can include { HEAD ~ a flange } along { TAIL ~ both sides } thereof , the connection mechanism being provided on each flange
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