Home / Standards / GB/T 9402-1988 GB/T 9402-1988 Abolished Minimum performance requirements on high fidelity microphones 高保真传声器最低性能要求 Standard Type GBT ICS 33.160.50 CCS M72 Status 废止 Issue Date 1988-06-17 Implementation 1988-11-01 Responsible Dept 工业和信息化部（电子） Drafting Unit N/A