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