| 摘要 |
The apparatus has a rotatable table for receiving a heavy drill bit tool with a threaded upper end to be raised generally vertically by movement of a lever, to which the table is pivotally mounted until the threads of the drill bit engage the mating threads on the lower end of a suspended oil well string pipe with rotation of the table coupling the two together. The table is provided with extendable and retractable arms having upstanding pins for receiving and holding different sizes of oil well tools.
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