| 摘要 |
992,431. Lattice girders. ROHREN-UND ROHEISENGROSSHANDEL G.m.b.H. May 30, 1962 [May 30,1961], No. 20814/62. Heading E1K. The upper boom of a lattice girder comprises C-section members 1, 3 connected by cross ties 2 the corners 7 of the C-section members' being rounded and the webs 8, 9 inset between the corners. The cross ties 2 are inverted channels with outwardly turned flanges. |
