Preventing exhaust air from the drill motor from blowing-off towards the working face

Full Title

Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor > Preventing exhaust air from the drill motor from blowing-off towards the working face

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