| 摘要 |
Means for closing an opening in a wall consisting of a plastic cloth and a flexible air duct having the length of the opening perimeter and having a nipple inserted into one end with the second end being deadly closed. The opening is closed by a plastic cloth with its ends covering butt ends of the opening and an air duct being laid over the cloth along the whole perimeter of the opening, the said air duct being spread inside the opening after air pumping into it, and thus holding the cloth in its place like a frame.</SDOA B>
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