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| box; box thread; female screw; female thread | |||
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| female national pipe thread | |||
| 母扣: 62 phrases in 11 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Construction | 1 |
| Drilling | 14 |
| Earth sciences | 1 |
| Electronics | 1 |
| Mechanics | 3 |
| Metallurgy | 3 |
| Nautical | 1 |
| Technology | 21 |
| Textile industry | 15 |
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