The coatings are simultaneously removed from the first major surface with {TAIL ~ the first grinding apparatus} from {HEAD ~ the second major surface} with the second grinding apparatus 
The coatings are simultaneously removed from the first major surface with { TAIL ~ the first grinding apparatus } from { HEAD ~ the second major surface } with the second grinding apparatus
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH