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40mm NATO NBC gas mask filter - The Prepper Stop
GP-5 gas mask - Wikipedia
🇵🇠35.5mm vintage color filters for B&W - blue, yellow, green - SovietCameraStore.com
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
Russian Civilian GP-5 Gas Mask And Bag - Lightweight, Full-Coverage, Grey Rubber Construction, Sealed Eye-Pieces, Includes Filter
Russian Gas Mask Filter 40mm thread - Soviet Military Surplus, unopened and sealed, NBC rated
Military Russian Soviet GP 5 40 Mm Gas Mask Filter Canister Charcoal for sale online | eBay
Smallest Soviet filter in my collection. Dated 1966, I am aware of 2 variants - those stamped 'Р-25' like my example, and some are stamped 'Бук-3'. : r/gasmasks
Soviet russian gas mask filter GP-7. Latest version Fits for many soviet masks. | eBay
Markings on a Soviet Gas Mask Filter by DrJorus on DeviantArt
Soviet russian gas mask GP-5 gas mask GP-5 gas mask with filter