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| 51. | head disk assembly |
| 头盘组合件 |
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| 52. | packed hole assembly |
| 满眼钻具组合 |
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| 53. | hanger bearing assembly |
| 悬管轴承组合 |
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| 54. | throttle switch assembly |
| 节流电门组合件 |
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| 55. | floor ceiling assembly |
| 楼板平顶组合构件 |
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| 56. | stabilized steerable assembly |
| 稳定式转向组合 |
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| 57. | pendulum drill assembly |
| 钟摆钻具组合 |
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| 58. | cascade vane assembly |
| 叶栅组合件 |
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| 59. | top-roll assembly |
| 上轧辊组合部件 |
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| 60. | rigid holding assembly |
| 刚性稳斜组合 |
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