摘要 |
<p>The cover (1) has a molded cover support recess provided with a recess edge. Multiple foldable cover support plates (I, II, III, IV) are securely stacked in the recess edge. Fastening units are detachably fixed in an edge region on each cover support plates. Fixing units are arranged in the region of the recess edge and operatively connected to each other. The fixing units are provided with permanent magnets. The permanent magnets of the cover support plates are arranged in alignment with an identical polarization cap.</p> |