{HEAD ~ The sharpened edge} 148 performs the major portion of the cutting during a cutting operation and is periodically sharpened by {TAIL ~ the sharpening mechanism} 78 
{ HEAD ~ The sharpened edge } 148 performs the major portion of the cutting during a cutting operation and is periodically sharpened by { TAIL ~ the sharpening mechanism } 78
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH