AENOR UNE-EN ISO 13920:1997 Welding. General tolerances in welded constructions. Dimensions of lengths and angles. Form and position. (ISO 13920:1996).
1997AENOR UNE-EN ISO 13920:1997 Welding. General tolerances in welded constructions. Dimensions of lengths and angles. Form and position. (ISO 13920:1996).