| 摘要 |
Characterised in that the support of two side sections 1, 2 which are positioned at the same distance and connected together in a detachable way and by forming a frame, by a lower transverse support section 3 as well as an upper transverse support section 4, in that the side sections 1, 2, mainly flat, have grooves 16 directed towards each other which are each limited by two parallel wing sections 11, 12 set opposite each other, and in that panels 5 to 8 can be inserted by resting them one on the other over the lower transverse support section 3. <IMAGE>
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