DIN EN 14509 Berichtigung 1-2009 自支撑双层隔音金属面板 工厂制作产品 规范 技术勘误DIN EN 14509-2007-02
Self-supporting double skin metal faced insulating panels - Factory made products - Specifications; German version EN 14509:2006, Corrigendum to DIN EN 14509:2007-02; German version EN 14509:2006/AC: 2008