A vacuum treatment system has {TAIL ~ an outer housing} which defines a substantially cylindrical inner wall around {HEAD ~ an axis} 
A vacuum treatment system has { TAIL ~ an outer housing } which defines a substantially cylindrical inner wall around { HEAD ~ an axis }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD