DIN EN 1804-3:2021
地下矿山机器 液压动力顶板支架的安全要求 第3部分:液压和电液控制系统;德文版 EN 1804-3:2020
Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 3: Hydraulic and electro hydraulic control systems; German version EN 1804-3:2020