{HEAD ~ The blade} 1, wherein {TAIL ~ the blade} is of rectangular overall shape and the first increase in thickness extends along the length of the blade 
{ HEAD ~ The blade } 1 , wherein { TAIL ~ the blade } is of rectangular overall shape and the first increase in thickness extends along the length of the blade
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH