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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 21410-2015 |
Petroleum and netural gas industries—Downhole equipment—Lock mandrels and landing nipples 石油天然气工业 井下设备 锁定心轴和定位接头 |
China National Standards nipples |
 English PDF |
| GB/T 6661-1986 |
nipples for insert earphones 插入式耳机的乳头状接头 |
China National Standards nipples |
English PDF |
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