Technical drawings - General principles of presentation - Part 21: Preparation of lines by CAD-systems (ISO 128-21:1997); German version EN ISO 128-21:2001
German title
Technische Zeichnungen - Allgemeine Grundlagen der Darstellung - Teil 21: Ausführung von Linien mit CAD-Systemen (ISO 128-21:1997); Deutsche Fassung EN ISO 128-21:2001
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