female drill rod tap
... 钻杆电测井：DPEL 钻杆打捞母锥：female drill rod tap 钻杆打捞矛：bull dog spear ...
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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。
The box taps is a special external tool cutting thread and fishing externally from dropped object such as tubing, drill pipe.
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