Patent classifications
E
FIXED CONSTRUCTIONS
Load children
E21
EARTH OR ROCK DRILLING; MINING
Load children
E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
Load children
E21B10/46
characterised by wear resisting parts, e.g. diamond inserts
Load children Filter patents View analytics View as hierarchy
E21B10/50
the bit being of roller type
Load children Filter patents View analytics View as hierarchy