| 摘要 |
building structures, mainly lattice girders, arches, etc. SUBSTANCE: grillwork has top and bottom girths made of angle pieces with tubbers facing each other, and grill bars embracing girth section. To this end, grill bars are made of strip bent at one central and two extreme lines originating from one point on its one end so that angle sections opposing the tubbers are formed at ends. EFFECT: eliminated twisting of bar in loading. 4 dwg
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