Nevertheless, the compressing step is performed after {HEAD ~ the other end} 12 of {TAIL ~ the heat pipe} 1 is sealed 
Nevertheless , the compressing step is performed after { HEAD ~ the other end } 12 of { TAIL ~ the heat pipe } 1 is sealed
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH