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IPC Subgroup
E21B 10/54

the bit being of the rotary drag type, e.g. fork-type bits

Introduced: January 1980

Last revised: January 2006

Full Title

Drill bits > characterised by wear resisting parts, e.g. diamond inserts > the bit being of the rotary drag type, e.g. fork-type bits

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

1 direct subcode

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