| Company | Timeline | Status | |
| Priorclave Scientific Limited Director • Technical Director | 29 Aug 1991←1 Month→30 Sep 1991 | Active | |
| Prior Group Holdings Limited Director • Technical Director | 29 Aug 1991←18 Years→8 Feb 2010 | Active | |
| Prior Clave Limited Director • Technical Director | 29 Aug 1991←18 Years→8 Feb 2010 | Active | |
| Prior E.M.E. Limited Director • Technical Director | 1 Jan 1970←40 Years→8 Feb 2010 | Dissolved | |
