Recreational diving services - Requirements for the training of scuba instructors - Part 2: Level 2 (ISO/DIS 24802-2:2012); German version prEN ISO 24802-2:2012
Chemicals used for treatment of water intended for human consumption - Sodium chloride for on site electrochlorination using membrane cells; German version EN 16370:2013— 28 стр.
Recreational diving services - Requirements for the training of scuba instructors - Part 2: Level 2 (ISO 24802-2:2014); German version EN ISO 24802-2:2014— 22 стр.
