| 摘要 |
Vent comprising a raised opening 2 and a movable cover, characterised in that the sides of the cover constitute the long sides of deformable parallelograms, the short sides of which are formed by connecting rods 25, 27 connected to each other via a long connecting rod 26, two of the connecting rods and the long connecting rods being supported by articulations 24 arranged near the top of the raised opening 2. <IMAGE>
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