long boring
... 长螺旋钻咀long auger bit 长镗孔long boring 闸极gate ...
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本实用新型公开了一种新型镗孔头，旨在提供一种高强度、高精密度、寿命长的新型镗孔头。
The utility model discloses a novel bored head, which aims to provide a novel bored head with high intensity, high precision and a long service life.
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