Home / Standards / GB/T 2987-1996 GB/T 2987-1996 Active Letter symbols of parameter for electronic tubes 电子管参数符号 Standard Type GBT ICS 31.100 CCS L35 Status 现行 Issue Date 1996-11-12 Implementation 1997-10-01 Responsible Dept 工业和信息化部(电子) Drafting Unit N/A