| Company | Timeline | Status | |
| Walker Electronics Limited Director • Company Director | 18 Oct 1991←26 Years→30 Oct 2017 | Active | |
| Walker Electronics Limited Secretary • Unreported | 18 Oct 1991←24 Years→22 Mar 2016 | Active | |
| Walker Ultrasonics Limited Secretary • Unreported | 18 Oct 1991←26 Years→30 Oct 2017 | Active | |
| Walker Ultrasonics Limited Director • Director | 18 Oct 1991←24 Years→5 Apr 2016 | Active | |
