| Company | Timeline | Status | |
| Instrotech Limited Director • Director | 16 Dec 2021←4 Years→Current | Active | |
| Martindale Electric Company Limited Director • Manager | 29 Nov 1997←28 Years→Current | Active | |
| Instrotech Holdings Limited Director • Engineer | 24 Jul 1991←34 Years→Current | Active | |
| Weirmead Limited Director • Engineer | 1 Jun 1991←31 Years→20 Sep 2022 | Dissolved | |
