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Patent certificate
Patent certificate for a ball with a valve stem
Patent Certificate for Internal Blowout Prevention Tool Pressure Detection Equipment
A patent certificate for an ultra-wear-resistant stabilizer
Patent Certificate for a Top Drive Rotary Casing Running Device Mounting Frame
Patent Certificate for a Multifunctional, Long-Life Square Drill Pipe Plug Valve
Patent Certificate for a Multifunctional Waste Recycling Device
Patent Certificate for a Device for Opening a Square Drill Pipe Plug Valve Under Pressure
Patent Certificate for a Highly Adaptable Stress-Dispersion Bidirectional Hydraulic Drilling Shock Tool
Patent Certificate for a Sliding Pin-Type Adapter Connector
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