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