Breathing mask seal
United States Patent 3343535
US Patent References:
/0577956.html
- - 0577956

/1288647.html
- - 1288647

Door seal for pressurized aircraft
- - 2560665

Respiratory masks
- - 2939458

Respirator with positive air seal
- - 3167070


Inventors:
Lytle, John P.
Hannan, David G.
Roberts, Charles C.
Publication Date:
09/26/1967
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Assignee:
MINE SAFETY APPLIANCES CO
Primary Class:
128/206.240
Other Classes:
D24/110.200
International Classes:
A62B18/02; A62B18/00