| 摘要 |
<p>The central parts (5, 9) of the sitting surface (1) and/or of the backrest (3) are made independent of the structures comprising the perimetral parts (7, 11) of said sitting surface (1) and/or of said backrest (3) and the respective rigid structures; readily accessible means are provided for obtaining anchorage and release of the central parts in order to enable their rapid and convenient replacement.
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