Related Clues:
- Invention of World War I
- Riot squad item
- Protective wear for airborne toxins
- Riot cop's gear
- Part of some hazmat suits
- Hazmat protection
- It could be a lifesaver
- Hazmat gear
- Doughboy's gear
- They protect against airborne poisons
- They were worn during WWII to prevent poisoning
- Swat-team gear
- Wartime breathing aid
- It clears the air
- Wartime safety device