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