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CPC
E21D5/016
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D5/00
Lining shafts Linings therefor
Current Industry
E21D5/016
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Patent Application
METHOD OF DRILLING AND OPERATING AN OIL OR GAS WELL, A METHOD OF PR...
Publication number
20140102691
Publication date
Apr 17, 2014
Ryan GIBSON
E21 - EARTH DRILLING MINING