Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21C
MINING OR QUARRYING
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37/00
Other methods or devices for dislodging with or without loading
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E21C37/06
by making use of hydraulic or pneumatic pressure in a borehole
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E21C37/14
by compressed air; by gas blast; by gasifying liquids
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