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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| HG/T 21522-2014 |
Plate flange manholes with davit to horizontal cover 水平吊盖板式平焊法兰人孔 |
China Chemical Industry
Standards Plate flange manholes |
 English PDF |
| HG/T 21519-2014 |
Plate flange manholes with davit to verticla cover 垂直吊盖板式平焊法兰人孔 |
China Chemical Industry
Standards Plate flange manholes |
English PDF |
| HG/T 21516-2014 |
Plate flange manholes with hinged cover 回转盖板式平焊法兰人孔 |
China Chemical Industry
Standards Plate flange manholes |
English PDF |
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