| Company | Timeline | Status | |
| Topcrown Limited Director • Engineer | 26 Feb 2004←6 Years→4 Feb 2011 | Active | |
| Focus Style Limited Director • Engineer | 21 Sep 1999←11 Years→4 Feb 2011 | Active | |
E & B Engineering Services (Special Works) Limited Director • Engineer | 10 Dec 1993←17 Years→4 Feb 2011 | Dissolved | |
| E & B Group Limited Director • Engineer | 10 Dec 1993←17 Years→4 Feb 2011 | Active | |
