{HEAD ~ The body} of {TAIL ~ a valve} is partially rebuilt by using electrical welding device, first support apparatus, second support apparatus and a driving mechanism 
{ HEAD ~ The body } of { TAIL ~ a valve } is partially rebuilt by using electrical welding device , first support apparatus , second support apparatus and a driving mechanism
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH