Home / Standards / GB/T 23809-2009 GB/T 23809-2009 Abolished Safety way guidance systems - Setting principles and requirements 应急导向系统 设置原则与要求 Standard Type GBT ICS 01.080.01 CCS A22 Status 废止 Issue Date 2009-05-06 Implementation 2009-11-01 Responsible Dept 国家标准委 Drafting Unit N/A