Home / Standards / GB/T 31255-2014 GB/T 31255-2014 Active Safety of machinery―Safety specification for the design of industrial type stairs, working platforms and walkways 机械安全 工业楼梯、工作平台和通道的安全设计规范 Standard Type GBT ICS N/A CCS J09 Status 现行 Issue Date 2014-12-05 Implementation 2015-07-01 Responsible Dept 国家标准委 Drafting Unit N/A