| 摘要 |
<p>A single-piece flat element has the shape of a cube with three areas. A first area (3) is designed to grip (9) a first board (100) from underneath. A second area (5) grips (11) a second board (102) from underneath. A third area (7) stretches over a transition area (13) designed to stretch over as an extending element (29) between the first and second areas.</p> |
