Breathing mask
United States Patent 2008677

Inventors:
Booharin, Leo Y.
Publication Date:
07/23/1935
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Assignee:
Bertram, Werner
Frederick, Muller
Primary Class:
128/206.150
Other Classes:
128/207.110, 128/206.170, 55/DIG.035
International Classes:
A62B18/08; A62B18/00