At least two openings are provided for treating or conveying through {HEAD ~ a respective workpiece} arranged along {TAIL ~ at least one great circle} of the cylindrical inner wall 
arranged along
At least two openings are provided for treating or conveying through { HEAD ~ a respective workpiece } arranged along { TAIL ~ at least one great circle } of the cylindrical inner wall
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH