| Company | Timeline | Status | |
| Celtek Calibration Limited Director • Engineer | 28 Aug 1997←3 Years→19 Sep 2000 | Active | |
| Celtek Calibration Limited Secretary • Engineer | 28 Aug 1997←3 Years→19 Sep 2000 | Active | |
| Celtek Electronics Limited Director • Electronics Engineer | 9 Aug 1992←33 Years→Current | Active | |
| Celtek Electronics Limited Secretary • Unreported | 9 Aug 1992←8 Years→19 Sep 2000 | Active | |
