| Company | Timeline | Status | |
| English Drilling Equipment Company Limited Secretary • Unreported | 15 Feb 1992←33 Years→Current | Active | |
Clearbold Limited Secretary • Unreported | 31 Dec 1991←24 Years→19 Jan 2016 | Dissolved | |
| English Drilling Equipment Company Limited Secretary • Unreported | 1 Jan 1970←56 Years→Current | Active | |
