a hydraulic device receiving discharged oil from {TAIL ~ said pump} to assist {HEAD ~ a steering wheel} by hydraulic power 
a hydraulic device receiving discharged oil from { TAIL ~ said pump } to assist { HEAD ~ a steering wheel } by hydraulic power
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH