Title:
Respirator
United States Patent 1615718


Inventors:
Olgard, Harry S.
Application Number:
US4812325A
Publication Date:
01/25/1927
Filing Date:
08/04/1925
Assignee:
Olgard, Harry S.
Primary Class:
Other Classes:
128/205.12, 128/205.24
International Classes:
A62B18/00
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