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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 7120-2009 |
Three-point quick-attaching coupler of implement to agricultural wheeled tractors - Category 3N、4N 农业轮式拖拉机和机具三点悬挂挂接器 3N类、4N类 |
China National Standards attaching |
 English PDF |
| GB/T 7178.7-2006 |
The operating for railway shunting Part 7: Operating for the train detaching and attaching 铁路调车作业 第7部分：列车摘挂作业 |
China National Standards attaching |
English PDF |
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