Another object of the invention is to provide {TAIL ~ such an engine} having a working piston with {HEAD ~ a relatively long stroke} 
Another object of the invention is to provide { TAIL ~ such an engine } having a working piston with { HEAD ~ a relatively long stroke }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD