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Patent certificate
Patent Certificate for High-Wear-Resistant Shoes Used in Oil and Gas Industry
Patent Certificate for a Casing Running Device Used in Oilfield Drilling
Patent Certificate for an Integral Spool-Type Cock Valve
A self-locking, compensating, bidirectional hydraulic downhole shock tool
Patent Certificate for a Drill-and-Mill Type Fishing Cone
Closed-type positive circulation plug valve
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