said hydromotors being independently operable, their operation being coordinated by {HEAD ~ first, second and third synchro drives} mounted respectively to said first, second and third elements to detect and measure rotation of {TAIL ~ the respective hydromotor rotary output means}, 
said hydromotors being independently operable , their operation being coordinated by { HEAD ~ first , second and third synchro drives } mounted respectively to said first , second and third elements to detect and measure rotation of { TAIL ~ the respective hydromotor rotary output means } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH