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