Close gearbox gets left and right hand threads to cut.

关闭变速箱获得左，钻床右手线程削减。

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Right and left hand threads is available.

左，右手线程可用。

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Gearbox gets left and right hand threads to cut.

齿轮箱得到左，钻床右手线程削减。

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Gearbox gets left and right hand threads to cut.

齿轮箱得到左，钻床右手线程削减。

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