sensing means for directly sensing and signaling the completion of {TAIL ~ the modulated increase} in {HEAD ~ fluid pressure}; and 
sensing means for directly sensing and signaling the completion of { TAIL ~ the modulated increase } in { HEAD ~ fluid pressure } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH