Home / Standards / MT 239-1991 MT 239-1991 Abolished 褐煤蜡技术条件 Standard Type MT23 ICS N/A CCS N/A Status Abolished Issue Date 1991-03-23 Implementation 1991-07-31 Centralized Committee 国家矿山安全监察局 Issuing Authority 国家矿山安全监察局