selector valve means connected between the fluid supply line and the force transmitting {HEAD ~ mechanism} for selectively directing {TAIL ~ pressurized fluid} from the fluid supply line to the force transmitting mechanism 
selector valve means connected between the fluid supply line and the force transmitting { HEAD ~ mechanism } for selectively directing { TAIL ~ pressurized fluid } from the fluid supply line to the force transmitting mechanism
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH