{HEAD ~ The side edge portion} of {TAIL ~ the front plate portion} 14 is internally bent to form a lip 14 a, the tip end of which is adapted to be contacted with the surface of a building board 30 to be fitted in the groove portion 12 
{ HEAD ~ The side edge portion } of { TAIL ~ the front plate portion } 14 is internally bent to form a lip 14 a , the tip end of which is adapted to be contacted with the surface of a building board 30 to be fitted in the groove portion 12
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH