Каталог DIN — национальные стандарты Германии
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DIN 55928-4 Beiblatt 2/A1-1991
Corrosion protection of steel structures by the application of organic or metallic coatings; preparation and testing of surfaces; representative photographic examples of surfaces after localized mechanical grinding (standard preparation grade PMa); amendment 1 to supplement 2 to DIN 55928 part 4
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