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| 牙轮钻头; 旋转钻头; 滚轮钻头; 切錾; 割錾; 滚轮钻头牙轮钻头 | |||
| 齿轮钻头 | |||
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| 牙轮背面 | |||
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шарошечное долото : 9 phrases in 3 subjects |
| Drilling | 3 |
| General | 4 |
| Oil / petroleum | 2 |
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