First and second grinding apparatuses are provided at {HEAD ~ a mounting portion} of {TAIL ~ the table}, opposite one another 
of
First and second grinding apparatuses are provided at { HEAD ~ a mounting portion } of { TAIL ~ the table } , opposite one another
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH