a variable throttle mechanism installed in said pump to change a flow rate of {HEAD ~ said discharged oil} from {TAIL ~ said pump} to said hydraulic device 
from
a variable throttle mechanism installed in said pump to change a flow rate of { HEAD ~ said discharged oil } from { TAIL ~ said pump } to said hydraulic device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH