A brazing oven includes {HEAD ~ an arrangement} employing {TAIL ~ a gas curtain} or barrier to cover the port or opening of the oven whenever the door is opened 
employing
A brazing oven includes { HEAD ~ an arrangement } employing { TAIL ~ a gas curtain } or barrier to cover the port or opening of the oven whenever the door is opened
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH