| Clue | Source | Date |
|---|---|---|
| Kids' building materials [Sidekick 1] | LA Times Daily | 05 Sep 2021 |
| Kids' building materials [Sidekick 1] | The Washington Post | 05 Sep 2021 |
| *Playthings for future engineers | Wall Street Journal | 02 Mar 2021 |
| Constructing things | ||
| Early building gear | ||
| Construction playthings | ||
| Future engineer's plaything | ||
| Kids' building playthings |