| 摘要 |
Novel corner reinforcement formed as a strip of plastic folded into a "U", with the central branch 6 markedly shorter than the side branches 5, which is arranged with said long lateral branches applied to perimetrally towards the inside of the structure, encircling the end turns of the peripheral springs, in which arrangement it can be stapled simultaneously with the padded quilting which covers the structure. <IMAGE>
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