The present invention relates to a method and {HEAD ~ devices} for identifying {TAIL ~ which cylinder} is in the compression phase 
The present invention relates to a method and { HEAD ~ devices } for identifying { TAIL ~ which cylinder } is in the compression phase
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH