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characterised by lowering in vertical position and subsequent tilting to operating position
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Industry
CPC
E21B43/118
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21B
EARTH DRILLING
E21B43/00
Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
Current Industry
E21B43/118
characterised by lowering in vertical position and subsequent tilting to operating position
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