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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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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