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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E21B10/46
characterised by wear resisting parts, e.g. diamond inserts
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E21B10/54
the bit being of the rotary drag type, e.g. fork-type bits
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