2021DIN EN 1804-2:2021-07 Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 2: Power set legs and rams; German version EN 1804-2:2020
2019DIN EN 1804-2:2019 Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 2: Power set legs and rams; German and English version prEN 1804-2:2019
2010DIN EN 1804-2:2010 Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 2: Power set legs and rams; German version EN 1804-2:2001+A1:2010