| http://www.w3.org/ns/prov#value | - The respiratory devices of the present invention are preferably held in place on a wearer's face by means well-known to those skilled in the art such as by adhesive or with straps or headbands secured to the respiratory device main body, formed by the central portion and first and second members of the respiratory device, or additional portion(s) of the respiratory device, at outboard positions on
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