| 摘要 |
A pre-cut sheeting of durable yet foldable plastic of substantially 4-6 mil thickness with a length of adhesion tape secured along the perimeter of its backing surface adjacent its outer edges, and a protective cover strip overlying the tape so as to be peelable therefrom at the time of intended use, employable in sealing out "bad air" from a room in the event of a chemical or biological attack.
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