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DIFF Subgroup
E21B 3/04

Rotary tables

Introduced: September 1968

Full Title

Rotary drilling > Surface drives for rotary drilling > Rotary tables

Of 2 combined children, 1 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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  • E21B 3/045 CPC only CPC only
  • E21B 3/06 Adaptation of rotary draw works to drive rotary tables IPC+CPC Available in IPC and CPC