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