Title:
Canisterless gas mask
United States Patent 2910979


Inventors:
Frank, Shanty
Brumfield, Richard S.
Application Number:
US73346058A
Publication Date:
11/03/1959
Filing Date:
05/06/1958
Assignee:
Frank, Shanty
Brumfield, Richard S.
Primary Class:
Other Classes:
128/206.12
International Classes:
A62B18/00
View Patent Images:
US Patent References:
2775967Respirator1957-01-01
2738788Respirator with speaking diaphragm1956-03-20
2416411Facepiece1947-02-25