{HEAD ~ The system} utilizes {TAIL ~ an implement driven trenching assembly} and a backfill pipe installation assembly 
{ HEAD ~ The system } utilizes { TAIL ~ an implement driven trenching assembly } and a backfill pipe installation assembly
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH