| Company | Timeline | Status | |
| Trioptics Instruments Ltd Director • Unreported | 27 Aug 1998←27 Years→Current | Active | |
| Trioptics Instruments Ltd Secretary • Sales Manager | 27 Aug 1998←27 Years→Current | Active | |
| Armstrong Optical Limited Director • Unreported | 21 Jul 1997←28 Years→Current | Active | |
