| 摘要 |
<p>A mask to be worn flush on the face, consists of a case delimited by a frame, and open on one side to the face. The frame includes a flange consisting of two rims extending in both directions of the plane of the frame and transverse to the frame. The frange is extended by a flexible cushion which extends towards the wearer's face, on both sides of the frame and which is curved inwardly, remote from the rim on which the cushion is cantilevered.</p> |
