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