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| 防止冲洗液冲坏岩芯底流钻头; 底喷式钻头 | |||
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| 底冲式钻头; 唇面排水眼钻头; 唇面排水孔钻头 | |||
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bottom discharge bit : 3 phrases in 1 subject |
| Technology | 3 |
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