ONORM B 1011 Teil.2-1981 Dimensional co-ordination in building; Modular co-ordination; Planning-rules for openings and built-in units in wall-zones of buildings (doors and Windows)
1981ONORM B 1011 Teil.2-1981 Dimensional co-ordination in building; Modular co-ordination; Planning-rules for openings and built-in units in wall-zones of buildings (doors and Windows)