INTERNATIONAL PATENT: GUANGZHOU METRO DESIGN & RESEARCH INSTITUTE CO., LTD., 广州地铁设计研究院股份有限公司, FOSHAN HUADUN CIVIL AIR DEFENCE ENGINEERING CO., LTD., 佛山华盾人防工程有限公司 FILES APPLICATION FOR "SEALED WATER BLOCKING APPARATUS FOR VENTILATION SHAFT OPENING OF SUBWAY STATION"

GENEVA, Nov. 23 -- GUANGZHOU METRO DESIGN & RESEARCH INSTITUTE CO., LTD. (No. 129, Yuncheng North Second RoadBaiyun DistrictGuangzhou, Guangdong 510410), 广州地铁设计研究院股份有限公司 (中国广东省广州市白云区云城北二路129号), FOSHAN HUADUN CIVIL AIR DEFENCE ENGINEERING CO., LTD. (No. 11 Qiaogao East Road, Xiqiao TownNanhai DistrictFoshan, Guangdong 528211), 佛山华盾人防工程有限公司 (中国广东省佛山市南海区西...