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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36/00
Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
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E21B36/001
Cooling arrangements
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