{HEAD ~ load pressure transducer} means for measuring the pressure in the supply line between the restrictor and the pressure sensor and providing {TAIL ~ an output signal} indicative thereof which is supplied to the control means; and 
for providing
{ HEAD ~ load pressure transducer } means for measuring the pressure in the supply line between the restrictor and the pressure sensor and providing { TAIL ~ an output signal } indicative thereof which is supplied to the control means ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH