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DIFF Subgroup
E21B 31/12

Grappling tools, e.g. tongs or grabs

Introduced: September 1968

Full Title

Fishing for or freeing objects in boreholes or wells > Grappling tools, e.g. tongs or grabs

Of 5 combined children, 4 exist in both systems.

1 codes are CPC-only extensions.

IPC defines codes here since 1980.

Child Classifications

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  • E21B 31/125 CPC only CPC only
  • E21B 31/14 with means deflecting the direction of the tool, e.g. by use of knuckle joints since 1980 IPC+CPC Available in IPC and CPC
  • E21B 31/16 combined with cutting or destroying means since 1980 IPC+CPC Available in IPC and CPC
  • E21B 31/18 gripping externally, e.g. overshot since 1980 IPC+CPC Available in IPC and CPC
  • E21B 31/20 gripping internally, e.g. fishing spears since 1980 IPC+CPC Available in IPC and CPC