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 FILES APPLICATION FOR "VIBRATION DAMPING APPARATUS AND DRILL STRING"

GENEVA, April 27 -- 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 (Room 1202, No.22 Chaoyangmen North StreetChaoyang District, Beijing 100728), 中石化石油工程技术服务股份有限公司 (中国北京市朝阳区朝阳门北大街22号1202房间), SIN...