CPC Subgroup
E21B 17/10 Wear protectors; Centralising devices
Full Title
Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Wear protectors; Centralising devices
10 direct subcodes
Child Classifications
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- E21B 17/12 Devices for placing or drawing out wear protectors