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            Expansion Joint Patent
            Belly Pipe Patent- multi-layer heat insulation
            Autoalarm Expansion Joint Patent
            Belly Pipe Patent-heat insulation
            Belly Pipe Patent-tuyere
            Oxygen Lance Patent
            Metal Hose Patent
            Expansion Joint Patent-cooling wall
            Oxygen Lance Patent

            ISO Quality System Certificate -Chinese

            ISO Quality System Certificate -English

            Imp. & Exp. Registration
            Special Equipment Manufacturing License -pressure pipeline
            Type Test Certificate-Metal Hose

            Type Test Certificate-Expansion Joint

            Trademark Registered Certificate
            Business License
            Member of High & New-tech Industry
            Supplier’s Access Certificate of China Petroleum

            Member of Petroleum, Petrochemical Group

            Member of Quality and Brand Association
            Member of Welding Association
            Credit Grade of CCB
            Supplier’s Access Certificate of China Petroleum
            A large bellows.Jpg automatic molding machine
             
             
             
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