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MSA Type N Gas Mask Gas: acid gas, organic vapor, CO, NH3; Canister: N-P100:Personal | Fisher Scientific
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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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