A device is present by which an alternating batch wise charging of {HEAD ~ the receiving container} of {TAIL ~ the second stage} takes place from the receiving containers of the first stage 
A device is present by which an alternating batch wise charging of { HEAD ~ the receiving container } of { TAIL ~ the second stage } takes place from the receiving containers of the first stage
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH