Also, it is to be noted that trailing surface 25 on each tooth need not be rectilinear; it may have a variety of contours as provided by {HEAD ~ the shape} of {TAIL ~ grinding wheel} 12 
Also , it is to be noted that trailing surface 25 on each tooth need not be rectilinear ; it may have a variety of contours as provided by { HEAD ~ the shape } of { TAIL ~ grinding wheel } 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH