Related Clues:

• Invention of World War I
• Riot squad item
• Riot cop's gear
• Part of some hazmat suits
• Hazmat protection
• It could be a lifesaver
• Hazmat gear
• Doughboy's gear
• Riot squad gear
• Swat-team gear
• Wartime breathing aid
• It clears the air
• Wartime safety device
• Hazmat team item
• Dystopian headwear