| Company | Timeline | Status | |
| Chromex Technology Limited Director • Engineer | 12 Mar 2010←8 Years→1 Dec 2018 | Active | |
| Avva Precision Engineering Limited Director • Engineer | 21 Jan 2005←20 Years→14 Oct 2025 | Dissolved | |
| Crabb Engineering (NW) Limited Director • Engineer | 3 Aug 2004←21 Years→14 Oct 2025 | Dissolved | |
| Crabb Engineering Limited Director • Engineer | 4 Jul 2002←16 Years→31 May 2019 | Active | |
