A shut off member is provided for {HEAD ~ each receiving container} of the preceding stage in {TAIL ~ the said channel} 
A shut off member is provided for { HEAD ~ each receiving container } of the preceding stage in { TAIL ~ the said channel }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL