Indicating gas-mask canister
United States Patent 1537519

Inventors:
Max, Yablick
Publication Date:
05/12/1925
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Assignee:
Max, Yablick
Primary Class:
422/119
Other Classes:
436/121, 55/DIG.034, 436/134, 422/239, 436/113, 422/120, 55/DIG.033, 436/122, 423/210, 436/2
International Classes:
A62B18/08; A62B18/00