| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| July 1920 |
|
Electrical Experimenter, July 1920 | Experimenter Publishing Company | MAGAZINE | 267 |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| July 1920 |
|
Electrical Experimenter, July 1920 | Experimenter Publishing Company | MAGAZINE | 267 |