| 摘要 |
Each element (1, 1') comprises a cross-piece (5, 5') from which three arms (2, 3, 4 - 2', 3', 4') depart, that is to say two side arms and a central arm, which comprises two small beams (20, 21, 20', 21') disposed side by side and whose cross-section is complementary when one element (1) is placed facing the other (1') whilst the side arms (3, 4) of one element (1) respectively engage in the other side arms (4', 3') of the second element (1'). <IMAGE>
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