| Company | Timeline | Status | |
| Blackhall Valve Services Limited Director • Company Director | 4 Jul 1991←7 Years→3 Jun 1999 | Active | |
| Blackhall Engineering Limited Director • Engineer | 4 Jul 1991←6 Years→31 Mar 1998 | Active | |
| Blackhall Engineering Limited Secretary • Unreported | 4 Jul 1991←7 Years→1 Jan 1999 | Active | |
