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日前,从淮南矿业集团获悉,由淮南矿业集团、安徽建筑工业学院、平安煤矿瓦斯治理国家工程研究中心共同申请的发明专利《三软地质条件下采空区留
Recently, it was learned from Huainan Mining Group that the invention patent jointly applied by Huainan Mining Group, Anhui Institute of Construction Technology and Ping’an Coal Mine Gas Treatment National Engineering Research Center "