Patent US 3809888A
| Patent number | US 3809888A (click link for details and documents via Google Patents) |
|---|---|
| Title | Photographic apparatus |
| Inventors | W. Riley Stock, Melvin M. Balsiger, William G. Beran |
| Company | Tektronix Inc |
| Filing date | 1971-09-13 |
| Grant date | 1974-05-07 |