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