| 摘要 |
An emergency exit respiratory mask device comprises a rebreathing bag, a face mask, and a head-covering cap, all formed of a single sheet of flexible transparent plastic. The sheet is folded upon itself and sealed along selected margins thereof to determine the boundaries of the bag, a filling and emptying passageway to the bag, and the cap. A mouthpiece is provided at the distal end of the passageway. A whistle is provided in the mouthpiece. An inflating spring is employed in the bag. Printed instructions are provided inside the bag and are readable through the bag material.
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