INTERNATIONAL PATENT: CHINA PETROLEUM & CHEMICAL CORPORATION, 中国石油化工股份有限公司, SINOPEC OILFIELD SERVICE CORPORATION, 中石化石油工程技术服务股份有限公司, SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD, 中石化胜利石油工程有限公司, DRILLING TECHNOLOGY RESEARCH INSTITUTE OF SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD, 中石化胜利石油工程有限公司钻井工艺研究院 FILES APPLICATION FOR "TOP DRIVE CONTROL SYSTEM AND METHOD BASED ON BI-DIRECTIONAL TRANSMISSION"

GENEVA, June 30 -- CHINA PETROLEUM & CHEMICAL CORPORATION (No.22 Chaoyangmen North StreetChaoyang District, Beijing 100728), 中国石油化工股份有限公司 (中国北京市朝阳区朝阳门北大街22号), SINOPEC OILFIELD SERVICE CORPORATION (12th Floor, A6 Huixin East StreetChaoyang District, Beijing 100029), 中石化石油工程技术服务股份有限公司 (中国北京市朝阳区惠新东街甲六号第十二层), SI...