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