This invention relates to {TAIL ~ a supplemental seal} attachable to {HEAD ~ a conventional oxygen mask} to prevent oxygen leakage when the mask is worn 
This invention relates to { TAIL ~ a supplemental seal } attachable to { HEAD ~ a conventional oxygen mask } to prevent oxygen leakage when the mask is worn
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH