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JOINING DEVICE OF STEEL FRAMED COLUMN CONSISTING OF ENCLOSED SECTIONAL MEMBER AND STEEL FRAMED BEAM?keyword=JOINING DEVICE OF STEEL FRAMED COLUMN CONSISTING OF ENCLOSED SECTIONAL MEMBER AND STEEL FRAMED BEAM

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*来源于国家知识产权局数据,仅供参考,专利服务由北京酷爱智慧知识产权代理公司提供