... in the centre of national-class economic development zone-Guangzhou Economic technological development zone.The company integrates "research, development, ... .In 1975,Tiantai factory was established,and had purchased import production equipment.In 1994,Guangzhou Longhuilong filter Co., ... established.In 2005,Vietnam office was established.In 2006,Guangzhou AK filter Co.,Ltd. was established. Nearly ...