{HEAD ~ The said device} controls {TAIL ~ discharge members} of the receiving containers of the preceding stage, which leads into a channel 
{ HEAD ~ The said device } controls { TAIL ~ discharge members } of the receiving containers of the preceding stage , which leads into a channel
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH