Respirator
United States Patent 2295119

Inventors:
Robert, Malcom
Whipple, Willis A.
Publication Date:
09/08/1942
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Assignee:
Malcom
Primary Class:
128/206.170
Other Classes:
55/484, 55/DIG.035
International Classes:
A62B18/00; A62B23/02; A62B23/00