E21B 4/006 — | Patent Classification Explorer

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E
E21
E21B
E21B 4/00
E21B 4/006

CPC Subgroup

E21B 4/006

Full Title

Drives for drilling, used in the borehole

CPC E21B 4/006

No direct equivalent in IPC

2 CPC-only subgroups

E21B 4/003 E21B 4/02

Data: WIPO (IPC), EPO/USPTO (CPC) — CC BY 4.0

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