In this extended portion 11c is formed {HEAD ~ ribs 11h} formed on {TAIL ~ both side edges} and an extended piece 11d 
formed on
In this extended portion 11c is formed { HEAD ~ ribs 11h } formed on { TAIL ~ both side edges } and an extended piece 11d
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH