A self-locking, compensating, bidirectional hydraulic downhole shock tool

A self-locking, compensating, bidirectional hydraulic downhole shock tool

Patent Certificate for a Drill-and-Mill Type Fishing Cone

Patent Certificate for a Drill-and-Mill Type Fishing Cone

Certificate of Qualification for Well Control Equipment Manufacturing Enterprises (Copy)

Certificate of Qualification for Well Control Equipment Manufacturing Enterprises (Copy)

Closed-type positive circulation plug valve

Closed-type positive circulation plug valve

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