CPC Subgroup
E21B 31/12 Grappling tools, e.g. tongs or grabs
Full Title
Fishing for or freeing objects in boreholes or wells > Grappling tools, e.g. tongs or grabs
5 direct subcodes
Child Classifications
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- E21B 31/14 with means deflecting the direction of the tool, e.g. by use of knuckle joints
- E21B 31/16 combined with cutting or destroying means
- E21B 31/18 gripping externally, e.g. overshot
- E21B 31/20 gripping internally, e.g. fishing spears