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