| http://www.w3.org/ns/prov#value | - Air or other breathable gas is supplied by a blower and passed along a flexible conduit to the mask assembly. [0004] The mask assembly generally comprises a relatively rigid shell, e.g., a frame, which defines a rearwardly opening cavity covering the patient's nose and/or mouth, and a soft portion, e.g., a cushion, which spaces the frame away from the face of the patient for comfortable contact. [
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