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