{TAIL ~ The first and second grinding wheels} 56 and 76 are operably connected to, respectively, {HEAD ~ the first and second motors} 50 and 70 such that when the first or second motor 50 and 70 is operated, the first or second grinding wheel 56 and 76 rotates 
{ TAIL ~ The first and second grinding wheels } 56 and 76 are operably connected to , respectively , { HEAD ~ the first and second motors } 50 and 70 such that when the first or second motor 50 and 70 is operated , the first or second grinding wheel 56 and 76 rotates
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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