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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7/00
Special methods or apparatus for drilling
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E21B7/06
Deflecting the direction of boreholes
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E21B7/061
the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
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