working with pulses

Full Title

Percussion drilling > with a reciprocating impulse member > the impulse member being a piston driven directly by fluid pressure > by liquid pressure > working with pulses

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