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