{TAIL ~ a load device} comprising a pressure sensor connected between {HEAD ~ the supply and return lines} which includes: 
{ TAIL ~ a load device } comprising a pressure sensor connected between { HEAD ~ the supply and return lines } which includes :
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH