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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 9253.2-1999 |
Petroleum andnatural gas industries--Threading，gauging，and threadinspection of casing，tubing and line pipe threads 石油天然气工业 套管、油管和管线管螺纹的加工、测量和检验 |
China National Standards threadinspection |
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