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Gas mask - Wikipedia
original and largely intact early 1940's american industrial chemical plant chlorine gas mask with original reinforced storage case
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Rough timeline of MSA Industrial Gas Masks, 1930's-1970's: Burrell Kops-Type and Diaphragm Masks (1930's), All-Vision (Early 1940's), Clearvue (Late 1950's), and Ultravue (Mid-1970's). : r/gasmasks
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