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