The upper jaw is pivotally attached near its inner end on its backside to the end of a dipper stick and {HEAD ~ a double action actuator} or cylinder for {TAIL ~ operative pivotal movement} of the upper jaw relative to the dipper stick 
for
The upper jaw is pivotally attached near its inner end on its backside to the end of a dipper stick and { HEAD ~ a double action actuator } or cylinder for { TAIL ~ operative pivotal movement } of the upper jaw relative to the dipper stick
OTH 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 HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH