| 摘要 |
<p>Wall element for incorporation as brick substitute in a wall of masonry, the wall element comprising an upper wall and a front wall, the upper wall being provided with a surface sloping downward towards the front wall, the upper wall furthermore being provided with a series of ribs protruding from the downward sloping surface. Preferably the ribs between them define ducts sloping downward towards the front wall. <IMAGE></p> |
