E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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47/00
Survey of boreholes or wells
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E21B47/09
Locating or determining the position of objects in boreholes or wells; , e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
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