I am living proof that gas masks work. I strapped one on recently in the third-floor conference room of Geomet, a Germantown-based "health and personal safety" company. And then I chopped up a raw ...

Click to open image viewer. CC0 Usage Conditions ApplyClick for more information. A Shalon Chemical Industries Ltd., adult model 4A1, Nuclear, Biological, and Chemical (NBC), black, rubber gas mask ...