YTTRIA
| Date | Clue |
|---|---|
| 2014-09-12 | Oxide used in picture tubes |
| 2010-05-29 | Powder used in lasers |
| 2010-01-02 | Oxide used in television tubes |
| 2000-11-04 | Rare-earth oxide |
| 1999-09-04 | Powder used in television tubes |
| Date | Clue |
|---|---|
| 2014-09-12 | Oxide used in picture tubes |
| 2010-05-29 | Powder used in lasers |
| 2010-01-02 | Oxide used in television tubes |
| 2000-11-04 | Rare-earth oxide |
| 1999-09-04 | Powder used in television tubes |