Home / Standards / GB 4053.1-1993 GB 4053.1-1993 Abolished Safety requirements for fixed steel vertical ladders 固定式钢直梯安全技术条件 Standard Type GB ICS N/A CCS C68 Status 废止 Issue Date 1993-12-24 Implementation 1994-07-01 Responsible Dept 应急管理部 Drafting Unit 应急管理部