Patent US 4899091A
| Patent number | US 4899091A (click link for details and documents via Google Patents) |
|---|---|
| Title | Cathode-ray-tube astigmatism correction apparatus |
| Inventors | Conrad Odenthal |
| Company | Tektronix Inc |
| Filing date | 1985-03-05 |
| Grant date | 1990-02-06 |