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| 鲍斯钻头 | |||
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| 镶嵌圆粒金刚石钻头 | |||
| 低质金刚石钻头; 金刚钻钻头; 金刚石钻头 | |||
| Bortz bit: 2 phrases in 1 subject |
| Technology | 2 |
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