DIN EN 81-80-2004 电梯建造和安装的安全准则.现有电梯.第80部分:提高现有载人电梯和客货两用电梯安全性的规则
Safety rules for the construction and installation of lifts - Existing lifts - Part 80: Rules for the improvement of safety of existing passenger and goods passenger lifts; German version EN 81-80:2003