with a reciprocating impulse member

Full Title

Percussion drilling > with a reciprocating impulse member

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

Child Classifications

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• E21B 1/14 driven by a rotating mechanism
• E21B 1/22 driven by electromagnets
• E21B 1/24 the impulse member being a piston driven directly by fluid pressure