| Clue | Source | Date |
|---|---|---|
| One who really knows the drill? | The Atlantic | 14 Jun 2026 |
| Person who's well-intentioned? | Wall Street Journal | 19 Aug 2025 |
| Rockefeller or Getty | New York Times | 06 Oct 2021 |
| Drilling luminary | Newsday | 08 Apr 2018 |
| Well-intentioned sort? | ||
| David or Charles Koch | New York Times | 21 Apr 2016 |
| Entrepreneur who's well-supplied? | ||
| One whose success is well-earned? | ||
| Getty, e.g. | ||
| H.L. Hunt, for one | ||
| Getty, for one |