| Company | Timeline | Status | |
| Explosionproof Generators Limited Secretary • Unreported | 5 Jul 2002←23 Years→Current | Active | |
| Flameproof Generators Limited Secretary • Unreported | 5 Jul 2002←23 Years→Current | Active | |
| Power Factory Limited Secretary • Unreported | 5 Jul 2002←23 Years→Current | Active | |
| Clyde Built Limited Secretary • Unreported | 5 Jul 2002←23 Years→Current | Active | |
| Vectronics Limited Secretary • Unreported | 15 Dec 1997←24 Years→22 Mar 2022 | Dissolved | |
| Ampco Engineering Limited Secretary • Unreported | 20 Aug 1990←35 Years→Current | Active | |
