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DIFF Subgroup
E21B 17/12

Devices for placing or drawing out wear protectors

Introduced: September 1968

Full Title

Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Wear protectors; Centralising devices > Devices for placing or drawing out wear protectors

No child classifications to compare. This is a leaf node in both IPC and CPC.