i have two gas mask filters on FE-41 and other FE-55 any diffrence and what are they used for?Gas mask/filter question?
No difference and the codes are more of a representatiion fo the year of the mask. The use is obvious, they filter the air.Gas mask/filter question?
I think they are German, I believe FE-41 was the markings on some WW2 German gas mask filters (41 being the date produced.
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