{HEAD ~ an extrudate member} having {TAIL ~ a closed sectional structure portion} and at an end thereof in the extruding direction, an integral joining end; and 
having
{ HEAD ~ an extrudate member } having { TAIL ~ a closed sectional structure portion } and at an end thereof in the extruding direction , an integral joining end ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH