| Company | Timeline | Status | |
| Wissettallian Limited Director • Consulting Engineer | 5 Jul 1991←8 Years→13 Aug 1999 | Active | |
| Wissettallian Limited Secretary • Unreported | 5 Jul 1991←8 Years→13 Sep 1999 | Active | |
| Lantis Properties Limited Director • Consulting Engineer | 20 Mar 1991←8 Years→13 Aug 1999 | Active | |
| Lantis Properties Limited Secretary • Unreported | 20 Mar 1991←8 Years→13 Aug 1999 | Active | |
