... 1994,Guangzhou Longhuilong filter Co., ltd.was established.In 1996,Shanghai filiale was established.In 1998,Hongkong(huilong)International developmentCo ... .In 2005,Vietnam office was established.In 2006,Guangzhou AK filter Co.,Ltd. was established. Nearly one hundred years ... with well-known domestic enterprises,but also cooperated with international customers in America,Middle east, Eastern Europe and ...