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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33/00
Sealing or packing boreholes or wells
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E21B33/02
Surface sealing or packing
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E21B33/03
Well heads; Setting-up thereof
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E21B33/035
specially adapted for underwater installations
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E21B33/0355
Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads
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