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