impact being obtained by gravity only, e.g. with lost-motion connection

Full Title

Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers > impact being obtained by gravity only, e.g. with lost-motion connection

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