00514cam a2200169 7i4500 0000016246 20211229090000.0 20211221113731.0 211221 -uk BI NM BS 499 Part 2C 1980 Welding terms and symbols. Part 2, symbols for welding. London: British Standards Institution, 1980. 1 print. Standards, Engineering -- Great Britain NM 0000006662 Book Standards HQ Library