Title:
Respiratory facial mask
United States Patent 2540567


Inventors:
Ray, Bennett V.
Application Number:
US2480148A
Publication Date:
02/06/1951
Filing Date:
05/03/1948
Assignee:
Ray, Bennett V.
Primary Class:
Other Classes:
128/207.11, D24/110.4
International Classes:
A62B18/02; A62B18/08
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US Patent References:
Foreign References:
GB458403A1936-12-14