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