| Company | Timeline | Status | |
| Wharf Engineering Limited Director • Engineer | 1 Jan 1970←55 Years→Current | Active | |
| Wharf Engineering Limited Secretary • Unreported | 1 Jan 1970←55 Years→Current | Active | |
| C. & A. Roberts Limited Director • Engineer | 1 Jan 1970←55 Years→Current | Active | |
| C. & A. Roberts Limited Secretary • Unreported | 1 Jan 1970←55 Years→Current | Active | |
