... 外螺纹瓶口 external screw thread finish 外螺纹切削 external thread cutting 外螺纹三通 male branch tee ...
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external superheater thread cutting 外螺纹切削
The box taps is a special external tool cutting thread and fishing externally from dropped object such as tubing, drill pipe.
母锥是一种专门从油管、钻杆等管状落物外壁进行造扣打捞的工具。
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