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step type drag bit : 52 phrases in 11 subjects |
| Chemistry | 1 |
| Compressors | 1 |
| Computer numerical control | 1 |
| Drilling | 3 |
| Electronics | 2 |
| Engineering geology | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 38 |
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