The superfinishing wheel of {TAIL ~ the second wheel head} sequentially superfinishes the object portions which have been ground by {HEAD ~ means} of the grinding wheel, while the second wheel head is moving toward the home position of the first wheel head, and in parallel with grinding which is performed by means of the grinding wheel 
The superfinishing wheel of { TAIL ~ the second wheel head } sequentially superfinishes the object portions which have been ground by { HEAD ~ means } of the grinding wheel , while the second wheel head is moving toward the home position of the first wheel head , and in parallel with grinding which is performed by means of the grinding wheel
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH