| 摘要 |
The breathing mask comprises an annular band of flexible material, suitable for encircling the neck and at least a lower portion of the head of a user, a shell connected to the band, its concavity towards the interior of the band, and suitable for defining a chamber able to accommodate the user's nose and mouth, and at least one tube extending from an opening formed in the shell to a region remote from the shell, in such a way that during use the user inhales air from the said region through the said tube.
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