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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41/00
Equipment or details not covered by groups E21B15/00 - E21B40/00
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E21B41/0007
for underwater installations
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E21B41/0014
Underwater well locating or reentry systems
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