Title:
Face mask
United States Patent 2625155


Inventors:
Engelder, Arthur E.
Application Number:
US20025050A
Publication Date:
01/13/1953
Filing Date:
12/11/1950
Assignee:
Engelder, Arthur E.
Primary Class:
Other Classes:
128/207.11, D24/110.4
International Classes:
A61M16/06
View Patent Images:
US Patent References:
2540567Respiratory facial mask1951-02-06
2506296Air-conditioned face mask1950-05-02