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