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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| TB/T 3397-2015 |
Bi-block concrete sleeper for CRTS ballastless track crts双块式无砟轨道混凝土轨枕 |
China Railway & Train
Standards Ball lock |
 English PDF |
| QB/T 2476-2000 |
(Ball lock) 球形门锁 |
China Light Industry
Standards Ball lock |
English PDF |
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