| 摘要 |
The unit has surface exposable extent comprising one or more part sections. A first part (7a) in the coupling device belonging to the one edge part (6d') for a first sheet-shaped part section (6d) works in conjunction with another corresponding second part (7b'). These first and second corresponding parts are orientated at a distance (a) from each other. The first edge part (6e') for the second sheet-shaped part section (6e) and the second edge part (6d") for the first sheet-shaped part section (6d) are arranged so that they directly or indirectly (73) work in conjunction with one another. |
