| 摘要 |
<p>Panels (9, 10) forming the flaps overlap. An edge region (11) of the first panel lies over an edge region of the second panel (12) in one location, and under it in another location. The edge regions of each panel lie alternately over and under each other along the opening line (7). A straight line can be constructed along the opening line, which is not overlapped by edge regions of the opposite flaps. The panels are covered by a layer, against which their rear sides lie and to which they are fastened.</p> |
