DIFF Main Group
E21B 15/00 Supports for the drilling machine, e.g. derricks or masts
Introduced: September 1968
Of 4 combined children, 2 exist in both systems.
2 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
Navigate with arrow keys, Enter to open
- E21B 15/02 specially adapted for underwater drilling (E21B15/04 takes precedence) IPC+CPC Available in IPC and CPC
- E21B 15/04 specially adapted for directional drilling, e.g. slant hole rigs since 1980 +1 CPC IPC+CPC Available in IPC and CPC