| Company | Timeline | Status | |
| Valve Control Limited Director • Engineer | 22 Jun 2004←21 Years→Current | Active | |
| Valve Control Limited Secretary • Engineer | 22 Jun 2004←21 Years→Current | Active | |
| Valve Control Limited Secretary • Engineer | 22 Jun 2004←20 Years→1 Jan 2025 | Active | |
| Valve Control Limited Director • Engineer | 22 Jun 2004←20 Years→1 Jan 2025 | Active | |
| Valvetech Limited Director • Engineer | 26 Jan 1999←24 Years→31 Dec 2023 | Active | |
| Valvetech Limited Secretary • Unreported | 12 Dec 1997←15 Years→1 Nov 2013 | Active | |
