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![Blue Russian filter, 1992. I am not entirely sure what these protected against (various nitrogen oxides?), the intake is sealed with a metal cap rather than a regular rubber plug. : r/gasmasks Blue Russian filter, 1992. I am not entirely sure what these protected against (various nitrogen oxides?), the intake is sealed with a metal cap rather than a regular rubber plug. : r/gasmasks](https://preview.redd.it/ry7rm31ln2141.jpg?width=640&crop=smart&auto=webp&s=c9def6b916e0337deb3dfeeefd66a46192197776)
Blue Russian filter, 1992. I am not entirely sure what these protected against (various nitrogen oxides?), the intake is sealed with a metal cap rather than a regular rubber plug. : r/gasmasks
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When using a nitrogen tank and not rebreather mask why is nothing happening and I'm breathing normally with no side effects? - Quora
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