Means for supplying to individual persons an oxygenated gas mixture
United States Patent 2185997

Inventors:
Heidbrink, Jay A.
Publication Date:
01/09/1940
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Assignee:
OHIO CHEMICAL AND MFG COMPANY
Primary Class:
128/204.290
Other Classes:
73/199, 128/207.180, 137/505.120
International Classes:
A62B9/02; A62B9/00