INTERNATIONAL PATENT: GUANGZHOU INSTITUTE OF BUILDING SCIENCE GROUP CO., LTD, 广州市建筑科学研究院集团有限公司, GUANGZHOU CONSTRUCTION ENGINEERING QUALITY AND SAFETY TESTING CENTER CO., LTD, 广州建设工程质量安全检测中心有限公司, GUANGZHOU MUNICIPAL ENGINEERING TEST AND TESTING CO., LTD, 广州市市政工程试验检测有限公司 FILES APPLICATION FOR "UNDERWATER NEGATIVE PRESSURE MULTI-SAMPLE SAMPLING AND DENSITY RAPID MEASUREMENT DEVICE AND METHOD"

GENEVA, Dec. 7 -- GUANGZHOU INSTITUTE OF BUILDING SCIENCE GROUP CO., LTD (No. 833 Baiyun Avenue North, Baiyun DistrictGuangzhou, Guangdong 510420), 广州市建筑科学研究院集团有限公司 (中国广东省广州市白云区白云大道北833号), GUANGZHOU CONSTRUCTION ENGINEERING QUALITY AND SAFETY TESTING CENTER CO., LTD (1 3 4th Floor, 833 Baiyun Avenue North, Baiyun DistrictGuangzhou, Guangdong 510420), 广州建设工程质量安全检测中心有限公司 (中国...