E21B 3/025

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9850708 Drill string subAug 18, 14Dec 26, 17NABORS DRILLING TECHNOLOGIES USA, INC.
6796390 Method and device for moving a tube in a borehole in the groundJul 18, 02Sep 28, 04SHELL OIL COMPANY