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