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