Unknown Year
| Company | FR |
| Year | 1940 |
| Cell Type | Product, Selenium |
| Part No. | EM-1 |
| Primary Use | Consumer, |
| Acquisition | Purchased |
Online Solar Cell Archive
Specimen 2523EM-1 FR Light Meter
Online Solar Cell Archive
Unknown Year
| Company | FR |
| Year | 1940 |
| Cell Type | Product, Selenium |
| Part No. | EM-1 |
| Primary Use | Consumer, |
| Acquisition | Purchased |
