Respiratory apparatus
United States Patent 2269500

Inventors:
Wildhack, William A.
Publication Date:
01/13/1942
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Assignee:
Wildhack, William A.
Primary Class:
128/204.250
Other Classes:
128/204.280, 128/205.120, 128/204.260, 137/908
International Classes:
A61M16/00; A62B7/00; A62B7/08