Method and {HEAD ~ device} for melting and refining {TAIL ~ materials} capable of being vitrified 
for melting
Method and { HEAD ~ device } for melting and refining { TAIL ~ materials } capable of being vitrified
OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH