Home / Standards / GB/T 13820-1992 GB/T 13820-1992 Abolished Magnesium alloy castings 镁合金铸件 Standard Type GBT ICS 77.120.20 CCS J31 Status 废止 Issue Date 1992-11-05 Implementation 1993-10-01 Responsible Dept 国家标准委 Drafting Unit N/A