A belt structure conveys the block of material from {HEAD ~ the first end} of {TAIL ~ the conveyor} over the second end of the conveyor 
of
A belt structure conveys the block of material from { HEAD ~ the first end } of { TAIL ~ the conveyor } over the second end of the conveyor
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH