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www.militarysurplusworld.com | Army Navy Surplus - Tactical | Big variety - Cheap prices | Military Surplus, Clothing, Law Enforcement, Boots, Outdoor & Tactical Gear
![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?auto=webp&s=61356c9a7b85b68585cbc192b8101aec5d5ccfc3)
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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