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