| Company | Timeline | Status | |
| Carbex Limited Director • Engineer | 24 Feb 2000←25 Years→Current | Active | |
| Carbex Limited Secretary • Engineer | 24 Feb 2000←25 Years→Current | Active | |
| Volkobind Engineering Co. Limited Secretary • Unreported | 29 Dec 1991←33 Years→Current | Active | |
| Volkobind Engineering Co. Limited Director • Engineer | 29 Dec 1991←33 Years→Current | Active | |
