grinding wheel means for grinding away {HEAD ~ portions} of {TAIL ~ the stock} to form saw teeth therein 
grinding wheel means for grinding away { HEAD ~ portions } of { TAIL ~ the stock } to form saw teeth therein
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH