GB/T 17888.1-2008 Safety of machinery - Permanent means of access to machinery - Part 1: Choice of a fixed means of access between two levels (English Version)
2020GB/T 17888.1-2020 Safety of machinery—Permanent means of access to machinery—Part 1: Choice of fixed means and general requirements of access
2008GB 17888.1-2008 Safety of machinery.Permanent means of access to machinery.Part 1:Choice of a fixed means of access between two levels
1999GB 17888.1-1999 Safety of machinery--Permanent means of access to machines and industrial plants-- Part 1:Choice of a fixed means of access between two levels