Title:
Combined face piece and automatic valve
United States Patent 1653572


Inventors:
Jackson, Dennis E.
Application Number:
US61004622A
Publication Date:
12/20/1927
Filing Date:
12/30/1922
Assignee:
Jackson, Dennis E.
Primary Class:
Other Classes:
128/203.13, 128/207.12
International Classes:
A61M16/06; A61M16/01
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