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| ball attachment; ballhead; spheric head; spherical head | |||
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| ball attachment | |||
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| spherical head; ball joint head | |||
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| knob top | |||
| 球形头: 96 phrases in 17 subjects |
| Architecture | 1 |
| Automobiles | 4 |
| Aviation | 1 |
| Chemistry | 2 |
| Compressors | 1 |
| Drilling | 4 |
| Electronics | 6 |
| General | 1 |
| Golf | 4 |
| Mechanics | 1 |
| Metallurgy | 7 |
| Nautical | 1 |
| Oil / petroleum | 6 |
| Plastics | 1 |
| Shipbuilding | 6 |
| Space | 1 |
| Technology | 49 |
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