| Company | Timeline | Status | |
| Independent Combustion Engineers Limited Secretary • Engineer | 31 Mar 1994←31 Years→Current | Active | |
| Industrial Combustion Engineers Limited Secretary • Engineer | 31 Mar 1994←10 Years→21 Oct 2004 | Active | |
| Independent Combustion Engineers Limited Director • Engineer | 31 Oct 1991←34 Years→Current | Active | |
| Industrial Combustion Engineers Limited Director • Engineer | 30 Jan 1991←34 Years→Current | Active | |
