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In American football, the offence of grasping another player's mask (the metal grid face protecter on his helmet) while trying to block or tackle him: see Penalty (American football)#Face mask. This disambiguation page lists articles associated with the same title. — “Face mask - Wikipedia, the free encyclopedia”, en.wikipedia.org
A patient wearing a simple face mask. The simple face mask (SFM) is a basic disposable mask, made of clear plastic, to provide oxygen therapy for patients who are experiencing conditions such as chest pain (possible heart attacks), dizziness, and minor hemorrhages. — “Simple face mask - Wikipedia, the free encyclopedia”, en.wikipedia.org
A diver in a pool wearing an AGA full face mask. A diver wearing an Ocean Reef full face mask  With a mouthpiece inside the full-face mask. Here, if the mask floods, the diver can breathe again before clearing the mask, and many Royal Navy and frogman's. — “Full face diving mask - Wikipedia, the free encyclopedia”, en.wikipedia.org