mousehole drilling
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除快速接单根外，还可用在打捞作业，找寻方向或需要慢转的钻井工具上，以及钻大小鼠洞用。
In addition to the fleetness connects single root, can also use at salvage the homework, search direction or demands the slow the artesian well tool that turn last, and drill the size rat hole use.
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