about 50 yrs.
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The use of masks goes back to the 1800s when inventors developed masks for the miners and soldiers. We still have our soldiers outfitted with gas masks.
Whenever there was a gas attack or the prospect of a gas attack.
Gas masks are used to protect people especially soldiers when gases are used in warfare or domestic disturbances. They were used in World War I to protect soldiers against mustard gas.
Because when the Germans stopped bombing gas bombs the people didn't think it was needed any more.
They were called Gas Masks