| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| December 1920 | Science and Invention, December 1920 | Experimenter Publishing Company | MAGAZINE | 847 |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| December 1920 | Science and Invention, December 1920 | Experimenter Publishing Company | MAGAZINE | 847 |