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IPC Subgroup
E21B 31/14

with means deflecting the direction of the tool, e.g. by use of knuckle joints

Introduced: January 1980

Last revised: January 2006

Full Title

Fishing for or freeing objects in boreholes or wells > Grappling tools, e.g. tongs or grabs > with means deflecting the direction of the tool, e.g. by use of knuckle joints

Classification Context

Section:
FIXED CONSTRUCTIONS
Class:
EARTH OR ROCK DRILLING; MINING
Subclass:
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS