| 摘要 |
PCT No. PCT/CH80/00134 Sec. 371 Date Aug. 3, 1981 Sec. 102(e) Date Aug. 3, 1981 PCT Filed Nov. 10, 1980 PCT Pub. No. WO81/01584 PCT Pub. Date Jun. 11, 1981.A construction element having a bridge-like portion of which first and second pillars are provided on the lower part thereof with a plurality of steps. The second pillar being connected by an inclined part to a channel-like portion provided with an outer edge. |
