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I am a student studying gas masks for a very important assignment. I was wandering if any of you guys know much about them? I am interested in their uses in the wars.

You're probably better off just googling it, as most of the information is freely available to the public.

Regards,
Amphibian

For your information it's not gas masks but respirators. Basically they work by using a removable filter on the front to filter the air so gas particles are unable to get into your body. Still don't work with CS gas though... The dreaded red eyes...