In {HEAD ~ the piston machine} of the present invention, the interior of {TAIL ~ the crankcase} is used as a third working chamber 
In { HEAD ~ the piston machine } of the present invention , the interior of { TAIL ~ the crankcase } is used as a third working chamber
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH