DB23/T 1496.20-2020 Standards for Equipping Labor Protection Articles Part 20: Transport Equipment and General Construction Machinery Operators and Related Personnel (English Version)
2020DB23/T 1496.20-2020 Standards for Equipping Labor Protection Articles Part 20: Transport Equipment and General Construction Machinery Operators and Related Personnel
2012DB23/T 1496.20-2012 Part 20 of Labor Protection Articles Equipping Standards: Transport Equipment Operators and Related Personnel