... 水力打捞矛 wash down spear 套管打捞矛 casing dog; casing ear; tricasing spear 下冲打捞矛 jar down spear ...
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捞管器 casing catcher; casing dog; mandrel socket; tube extractor; tubing catcher
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bull dog casing spear 套管打捞矛
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The dog chain, the movable end of which is connected with a dog ring by a fastener is connected with the line wheel by a line wheel casing mouth and wound.
活动端用扣具与狗项圈相连的狗链通过线轮壳口与线轮相连并卷绕起来；
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