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