" Mechanical Seal for Vessel under Pressure and Corrosive Conditions " and " Agitating Equipment with Self-lifting Device " have gotten the Certificates of Utility Model Patent
2009 / 12 / 14

ZL 2009 2 0003160.6   Mechanical Seal for Vessel under Pressure and Corrosive Conditions

ZL 2009 2 0003159.3   Agitating Equipment with Self-lifting Device