| 摘要 |
A collapsible, foldable, mask is provided which is made from a single blank, creased or folded to make a front and a back panel, with the fold forming the tops of both panels. The sides of the front panel are joined for a portion of their length to the corresponding sides of the back panel. The mask can be stored or shipped in a flat two-dimensional, partly assembled mode and can be opened or assembled to their dimensional form to be worn on the head of a user.
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