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