A casting furnace is fed {HEAD ~ an inert gas} under pressure through a feed line with {TAIL ~ the pressure} being regulated by a melt level control device 
A casting furnace is fed { HEAD ~ an inert gas } under pressure through a feed line with { TAIL ~ the pressure } being regulated by a melt level control device
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH