Gas masks were gradually developed in the 1800s and the exact year you need is in the link below.
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They were called Gas Masks
how did gas masks change society? what
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.
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.