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
17/00
Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables;; Casings; Tubings
Load children Filter patents View analytics View as hierarchy