| 摘要 |
Each of the legs (4, 4') comprises a slanting face (4a, 4d) and two flat sections (4b, 4c - 4e, 4f) made transversely. When the legs (4, 4' of two elements are placed one on top of the other, a pin (7) is engaged in their aligned holes (4g, 4h). The pin (7) forms part of a clip (8) whose joining piece (10) locks the said clip relative to one of the legs. <IMAGE>
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