Double-rail double-curtain inorganic composite special-grade fire resisting shutter bottom plate adjustable installation assembly von HE YONGFU, LYU ZHENYU, SITU QIUQUAN, SUN ZHONGFEI, SONG XILU, XIANG XUEJUN, WANG MENGMENG, LYU CHAO, FAN YUANYUAN, XIANG CHANGBO, ZHANG PENGBO, ZENG ZHONG, PAN YANKUI, LI ZHENFENG, YANG YULONG, XIA FUCHANG, ZHANG PENG, BI LINQING, ZHENG JIAHAO, LIN AO, CHEN DONGXU, CHEN YANYAN, PENG XUELING

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