| Clue | Source | Date |
|---|---|---|
| Method of hardening metals (4,9) | ||
| Metallurgical process (4,9) | ||
| First draft of a 1995 De Niro/Pacino thriller? | LA Times Daily | 22 Sep 2019 |
| First draft of a 1995 De Niro/Pacino thriller? | The Washington Post | 22 Sep 2019 |
| First draft of a 1995 De Niro/Pacino thriller? | ||
| T-bond for metal temperers |