INTERNATIONAL PATENT: CHINA NATIONAL PETROLEUM CORPORATION, 中国石油天然气集团有限公司, CNPC ENGINEERING TECHNOLOGY R&D COMPANY LIMITED, 中国石油集团工程技术研究院有限公司 FILES APPLICATION FOR "DOWNHOLE FISH DETECTION METHOD AND SYSTEM"
GENEVA, April 27 -- CHINA NATIONAL PETROLEUM CORPORATION (9 Dongzhimen North Street,Dongcheng District, Beijing 100007), 中国石油天然气集团有限公司 (中国北京市东城区东直门北大街9号), CNPC ENGINEERING TECHNOLOGY R&D COMPANY LIMITED (Building 1, Yard 5, Huanghe Street,Changping District, Beijing 102206), 中国石油集团工程技术研究院有限公司 (中国北京市昌平区黄河街5号院1号楼) filed a patent a...
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