Protective coverings for the face, particularly the mouth and nose, to maintain antiseptic conditions, to protect the wearer from contamination and to prevent droplets from the wearer's nose and mouth from spreading in the air. It includes surgical masks worn in the operating room and dentists' offices. It refers also to devices designed to cover the mouth and nose for administration of inhalation anaesthetics, oxygen, or other gases.
(12 Dec 1998)
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