CPC Subgroup
E21B 17/02 Couplings; joints
Full Title
Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Couplings; joints
6 direct subcodes
Child Classifications
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- E21B 17/03 between drilling rod or pipe and drill motor , e.g. between drilling rod and hammer
- E21B 17/04 between rod and bit or between rod and rod
- E21B 17/08 Casing joints