Home / Standards / GB/T 4189-1984 GB/T 4189-1984 Abolished Doped tungsten bars 掺杂钨条 Standard Type GBT ICS 77.080 CCS H63 Status 废止 Issue Date 1984-03-09 Implementation 1984-11-01 Responsible Dept 工业和信息化部(电子) Drafting Unit N/A