... filter Co., ltd.was established.In 1996,Shanghai filiale was established.In 1998,Hongkong(huilong)International developmentCo.,Ltd.was established.In ... was established.In 2005,Vietnam office was established.In 2006,Guangzhou AK filter Co.,Ltd. was established. Nearly one ... with well-known domestic enterprises,but also cooperated with international customers in America,Middle east, Eastern Europe and ...