Many respirators have either mild history or widely known history, but what angers me is lack of info or even a page of an item like the Polish SR-1.  Where there is some info, it just hasn't been compiled into a single source for many to view in a single space.  And it doesn't help when you're buying in the US and has them listed as Czech Gas Masks.  When most of this info comes out it's understandably in Polish, but it gets blocked out by other headwound and casualty gas masks.

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