| Company | Timeline | Status | |
| O B C Management Limited Director • Air Conditioning | 25 Jun 2001←5 Years→26 Jul 2006 | Active | |
| J.L. Harrison & Son (Air Conditioning) Limited Director • Engineer | 6 Sep 1991←34 Years→Current | Active | |
| O B C Management Limited Director • Director | 18 Apr 1991←2 Years 1 Month→27 May 1993 | Active | |
