{HEAD ~ the machine} further comprising {TAIL ~ a slide valve and control passages} through which a working medium is conducted to and from the first and second working chambers, 
{ HEAD ~ the machine } further comprising { TAIL ~ a slide valve and control passages } through which a working medium is conducted to and from the first and second working chambers ,
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH