| Company | Timeline | Status | |
| Powermaster Service Limited Director • Housewife | 31 Dec 1989←7 Years→31 Mar 1997 | Dissolved | |
| Powermaster Service Limited Secretary • Unreported | 31 Dec 1989←7 Years→31 Mar 1997 | Dissolved | |
| Powermaster Cooling Limited Director • Housewife | 26 Jul 1989←21 Years→1 Jul 2011 | Active | |
| Powermaster Cooling Limited Secretary • Unreported | 26 Jul 1989←18 Years→25 Jun 2008 | Active | |
