Means engaging the bore entrance, e.g. hoods for collecting dust

Full Title

Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor > Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes > Means engaging the bore entrance, e.g. hoods for collecting dust

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