| Company | Timeline | Status | |
| Marconi's Wireless Telegraph Company Limited Director • Ultrasonic Engineer | 5 Jun 2003←22 Years→Current | Active | |
| Marconi's Wireless Telegraph Company Limited Secretary • Ultrasonic Engineer | 5 Jun 2003←22 Years→Current | Active | |
| Ultrasonic Services Limited Director • Company Director | 19 Jul 1991←31 Years→23 Aug 2022 | Dissolved | |
