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Patent certificate
Patent Certificate for a Plate-type Float Valve Assembly with an Eccentric Structure
Patent Certificate for a New Type of Plug Valve with Lubricating and Filling Functions
Patent Certificate for a Dual-Use Switching Spool
Patent Certificate for a Gas Drilling Bypass Valve
Patent Certificate for a Gas Drilling Tool Float Valve
Patent Certificate for a Casing Section Milling Tool
Patent Certificate for a New Type of Salvage Spear
A patent certificate for an insert-type female cone
Patent Certificate for a Traction Reaming Tool Used in Sidetrack Wells
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