| 摘要 |
A groove (14) extends all the way across the top side (13) of the block along the length of the block (10). The groove is close to the rear side (12) of the block. This top side links the block`s rear side with its facade side. A second wall block rests on the top side of the first block and fits into this groove and presses against the rear side of the first block. |
