... AK Filter Co.,Ltd has been dedicating ourselves to filter products since 1975. It is subordinated to Huilong Group , engaged in ... purchased import production equipment.In 1994,Guangzhou Longhuilong filter Co., ltd.was established.In 1996,Shanghai filiale was established.In ... .In 2006,Guangzhou AK filter Co.,Ltd. was established. Nearly one hundred years development,Huilong Group has not only built long ...