| 摘要 |
<p>696,851. Building slabs; walls. DOANIDES. P. J. Mav 25, 1951 [May 27, 1950]. No. 12257/51. Classes 20(iv) and 87(i) A wall comprises slabs 2 which are provided on their upper and/or lower faces with semi-frustoconical or semi-cylindrical projections 1 adjacent the grooved side faces 4 to receive metal rings for coupling adjacent slabs together or slabs to posts. The slabs may be hollow and may be filled with exfoliated vermiculite, asbestos, slag wool or aerated concrete.</p> |
