| Company | Timeline | Status | |
| Marshall Close Maintenance Company Limited Secretary • Director Consultant  | 6 May 2004←14 Years→30 Jun 2018  | Active  | |
| Keramik Air Systems Limited Secretary • M D Consultant  | 17 Jan 2001←3 Years→18 Oct 2004  | Dissolved  | |
| Keramik Air Systems Limited Secretary • M D Consultant  | 25 Sep 1991←6 Years→7 Dec 1997  | Dissolved  | |
| Keramik Air Systems Limited Director • Consultant Engineer  | 13 Nov 1978←43 Years→16 Nov 2021  | Dissolved  | |
