| Company | Timeline | Status | |
| Ultrasonic Management Limited Director • Petroleum Eng | 1 Mar 2006←16 Years→24 May 2022 | Dissolved | |
| Jalowiecki Oilfield Engineering Services Ltd Director • Petroleum Engineer | 23 May 1996←29 Years→Current | Active | |
| Jalowiecki Oilfield Engineering Services Ltd Secretary • Petroleum Engineer | 23 May 1996←6 Years→1 Jul 2002 | Active | |
