| Clue | Source | Date |
|---|---|---|
| Tech training sites | LA Times Daily | 25 Jul 2022 |
| Tech class sites | LA Times Daily | 22 Aug 2021 |
| Tech class sites | The Washington Post | 22 Aug 2021 |
| Techs' training centers | USA Today | 31 Oct 2017 |
| Techs' training centers | ||
| Tech training sites | Newsday | 24 Jul 2016 |
| Tech training centers |