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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6/00
Drives for drilling with combined rotary and percussive action
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E21B6/06
the rotation being intermittent, e.g. obtained by ratchet device
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E21B6/08
Separate drives for percussion and rotation
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