The sensing means includes a directing means for directing {HEAD ~ pressurized fluid} to {TAIL ~ the second reaction chamber} upon completion of the dual modulated increases in fluid pressure 
to
The sensing means includes a directing means for directing { HEAD ~ pressurized fluid } to { TAIL ~ the second reaction chamber } upon completion of the dual modulated increases in fluid pressure
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH