An adhesively backed strip of foam or sponge rubber is adapted to be removably secured within the upper peripheral edge of {HEAD ~ a conventional oxygen mask} used to deliver {TAIL ~ oxygen} to a patient 
An adhesively backed strip of foam or sponge rubber is adapted to be removably secured within the upper peripheral edge of { HEAD ~ a conventional oxygen mask } used to deliver { TAIL ~ oxygen } to a patient
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH