The lower jaw is attached near its inner end on {TAIL ~ its backside} to the dipper stick by a linkage for {HEAD ~ operative pivotal movement} of the upper jaw relative to the lower jaw 
The lower jaw is attached near its inner end on { TAIL ~ its backside } to the dipper stick by a linkage for { HEAD ~ operative pivotal movement } of the upper jaw relative to the lower jaw
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH