E21B 17/1092 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup

E21B 17/1092

Full Title

Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings > Wear protectors; Centralising devices

This code exists only in CPC.

Diff view requires codes present in both systems.