Patent classifications
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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E21B47/08
Measuring diameters or related dimensions at the borehole
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E21B47/085
using radiant means, e.g. acoustic, radioactive or electromagnetic
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