Home / Standards / GB/T 11450.4-1989 GB/T 11450.4-1989 Active Hollow metallic waveguides--Part 4:Relevant specifications for circular waveguides 空心金属波导 第四部分:圆形波导有关规范 Standard Type GBT ICS 33.120.10 CCS L26 Status 现行 Issue Date 1989-06-30 Implementation 1990-03-01 Responsible Dept 工业和信息化部(电子) Drafting Unit N/A