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