| Company | Timeline | Status | |
| Celtek Calibration Limited Director • Electronics Engineer | 28 Aug 1997←28 Years→Current | Active | |
| Celtek Calibration Limited Director • Electronics Engineer | 28 Aug 1997←27 Years→15 Jul 2025 | Active | |
| Celtek Electronics Limited Director • Electrical Engineer | 9 Aug 1992←8 Years→17 Sep 2000 | Active | |
