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| Spülbohren n; Bohren mit Dicktrübe | |||
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mud drilling : 27 phrases in 7 subjects |
| Chemistry | 2 |
| Coal | 4 |
| Environment | 6 |
| Metallurgy | 1 |
| Mining | 10 |
| Oil / petroleum | 3 |
| Technology | 1 |
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