The present invention further provides a controller which monitors {HEAD ~ the movement} of {TAIL ~ each hydraulic actuator}, and temporarily interrupts the operation of the leading actuator to ensure that both actuators move in unison 
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The present invention further provides a controller which monitors { HEAD ~ the movement } of { TAIL ~ each hydraulic actuator } , and temporarily interrupts the operation of the leading actuator to ensure that both actuators move in unison
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH