slip joint casing
... casing head and landing joint 联顶节与套管头 flush joint casing 平接式套管 slip joint casing 套接套管 ...
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套接式套管 casing with inserted joints
套管接合套筒接头 faucet joint
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所述过渡踏板机构包括过渡踏板、气弹簧、横杆、连接杆以及相互套接的活动杆上套管和下套管；
The transition pedal mechanism comprises a transition pedal, a gas spring, a cross rod, a connecting rod, and an upper and a lower sleeves of a movable rod.
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