| Company | Timeline | Status | |
| Priorclave Scientific Limited Director • Engineer | 29 Aug 1991←34 Years→Current | Active | |
| Prior Group Holdings Limited Director • Managing Director/engineer | 29 Aug 1991←34 Years→Current | Active | |
| Prior Clave Limited Director • Chairman & Engineer | 29 Aug 1991←34 Years→Current | Active | |
| Prior E.M.E. Limited Director • Managing Director/engineer | 29 Aug 1991←20 Years→15 Mar 2012 | Dissolved | |
