| Company | Timeline | Status | |
| Heap Economiser Limited Director • Secretary | 23 Jul 1991←13 Years→31 Aug 2004 | Active | |
| Heap Economiser Limited Secretary • Unreported | 23 Jul 1991←13 Years→31 Aug 2004 | Active | |
| Heap Dawson Limited Secretary • Unreported | 23 Jul 1991←13 Years→31 Aug 2004 | Active | |
