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Technician wears an NH3 ammonia protective mask to help an unconscious colleague suffocate urgently due to
MSA® Advantage® Chin-Type Gas Mask Cannister: Phosphine/Ammonia/Chlorine/P100 Canister - Conney Safety
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Two MSA All Vision ammonia Respirators from the early 1940s (I assume) the head harness states the mask was patented 1921 but that's obviously not the year these were made. : r/gasmasks
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