{TAIL ~ An adhesively backed strip} of {HEAD ~ foam} or 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 
{ TAIL ~ An adhesively backed strip } of { HEAD ~ foam } or 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
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH