| 摘要 |
678,732. Floors and roofs. MARLEY TILE CO., Ltd., and AISHER, O. A. March 29, 1951 [March 29, 1950], No. 7856/50. Class 20(iv) Floor or roof beams or joists 22 are crossbraced by pairs of metal strip members 10, 11 pivoted together at 16 and having intermediate portions twisted at right angles 12-15, the ends of the twisted portions being bent over and secured to the tops and bottoms of the joists. |
