| Company | Timeline | Status | |
| Impact Diamond Tools Limited Director • Engineer | 26 Oct 1991←9 Years→2 Aug 2001 | Active | |
| Diaforce Limited Director • Engineer | 26 Oct 1991←12 Years→31 Dec 2003 | Active | |
| Diagrit Electrometallics Limited Director • Engineer | 26 Oct 1991←12 Years→29 Jul 2004 | Active | |
| Kendia (Diamond Products) Limited Director • Engineer | 26 Oct 1991←12 Years→29 Jul 2004 | Active | |
| D.K. Holdings Limited Director • Engineer | 26 Oct 1991←12 Years→29 Jul 2004 | Active | |
