ONORM DIN 55928-4 Beib.1-1992 Protection of steel structures from corrosion by organic and metallic coatings - Preparation and testing of surfaces - Photographic Standards
1992ONORM DIN 55928-4 Beib.1-1992 Protection of steel structures from corrosion by organic and metallic coatings - Preparation and testing of surfaces - Photographic Standards