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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| HG/T 21523-2014 |
Slip on flange manholes with davit to horizontal cover 水平吊盖带颈平焊法兰人孔 |
China Chemical Industry
Standards Slip flange manholes |
 English PDF |
| HG/T 21520-2014 |
Slip on flange manholes with davit to vertical cover 垂直吊盖带颈平焊法兰人孔 |
China Chemical Industry
Standards Slip flange manholes |
English PDF |
| HG/T 21517-2014 |
Slip on flange manholes with hinged cover 回转盖带颈平焊法兰人孔 |
China Chemical Industry
Standards Slip flange manholes |
English PDF |
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