Home / Standards / MT/T 321-1993 MT/T 321-1993 Abolished 采煤机螺旋滚筒 Standard Type MT ICS N/A CCS N/A Status Abolished Issue Date 1993-03-25 Implementation 1993-10-01 Centralized Committee 国家矿山安全监察局 Issuing Authority 国家矿山安全监察局