INTERNATIONAL PATENT: PING AN COAL MINING ENGINEERING TECHNOLOGY RESEARCH INSTITUTE CO., LTD, 平安煤炭开采工程技术研究院有限责任公司, HUAINAN MINING (GROUP) CO., LTD, 淮南矿业（集团）有限责任公司 FILES APPLICATION FOR "METHOD FOR DRAINING WATER OF COAL MINE GOAFS BY CROSSING ADJACENT GOAF"

GENEVA, Feb. 15 -- PING AN COAL MINING ENGINEERING TECHNOLOGY RESEARCH INSTITUTE CO., LTD (Building 6, Wisdom Valley, Hi-Tech ZoneHuainan, Anhui 232001), 平安煤炭开采工程技术研究院有限责任公司 (中国安徽省淮南市高新区智慧谷6号楼), HUAINAN MINING (GROUP) CO., LTD (No.1 Dongshan Middle RoadHuainan, Anhui 232001), 淮南矿业（集团）有限责任公司 (中国安徽省淮南市洞山中路1号) filed a...