... rely on high responsibility,advance technology ,communicate with enterprises in domestic and overseas.In 19th century,Yu Family ... production equipment.In 1994,Guangzhou Longhuilong filter Co., ltd.was established.In 1996,Shanghai filiale was established.In ... 1998,Hongkong(huilong)International developmentCo.,Ltd.was established.In 2003,Beijing filiate was established. ...