This part of GB/T 4476 specifies the graphic symbols required in drawings or technical documents when drawing metal hulls. This section applies to the drawing of metal hulls of civilian ships and military auxiliary ships.
GB/T 4476.2-2008 history
2008GB/T 4476.2-2008 Drawing for metal hull of ships.Part 2:Graphical symbols
1984GB/T 4476.2-1984 Drawings for metal hull of ships--Graphical symbols