Canisterless gas mask
United States Patent 2910979
US Patent References:
Facepiece
- - 2416411

Respirator with speaking diaphragm
- - 2738788

Respirator
- - 2775967


Inventors:
Frank, Shanty
Brumfield, Richard S.
Publication Date:
11/03/1959
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Assignee:
Frank, Shanty
Brumfield, Richard S.
Primary Class:
128/201.150
Other Classes:
128/206.120
International Classes:
A62B18/00