| 摘要 |
The block is noteworthy in that it is provided within its thickness and over all or part of its longitudinal and/or transverse sides with a plurality of cut-outs or slots (3) formed alternately and successively starting from the inside of the pre-established frame and from the outside of the latter, defining tongues (4) providing the frame obtained with an elastic capability of stretching by elongation and deformation by a succession of concertina folds. <IMAGE>
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