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