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   Aug. 1985 3 Types of Air Purifier standard approval
   Jul. 1987 3 Types of Odor Remover standard approval
   Oct. 1988 "Air Reflector for Electrostatic Dust Collector" Utility Model Reg.     NO. 38647
   Dec. 1989 Q-Mark (Excellent Quality) approval    NO. 89-009
   Jan. 1990 KS-mark (Korean Standard) approval    NO. 90-7418
   Dec. 1997 "Air Handing Unit with Air Neutralizer" Utility Model Reg.    NO. 114878
   Mar. 1998 "Handy Smoking Booth "Utility Model Reg.    NO. 120020
   Mar. 1998 "Somoking Area" Utility Model Reg.    NO. 120021
   Oct. 1998 "Bracket for Electrostatic Dust Collectors Gap" Utility Model Reg.    NO. 134483
   Oct. 1998 "Stopper for Electrostatic Dust Collectors Blade" Utility Model Reg.    NO. 134484
   Oct. 1998 "Air Purifier with Air Neutralizer" Utility Model Reg.    NO. 134485
   Oct. 1999 "Hard Lock for Genuine Parts" Patent Pending    NO. 10-1999-0037513