Patent US 4800432A
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| Patent number | US 4800432A |
|---|---|
| Title | Video Difference key generator |
| Inventors | Ronnie D. Barnett, Steven M. Parkes |
| Company | The Grass Valley Group, Inc. |
| Filing date | 1986-10-24 |
| Grant date | 1989-01-24 |
| Cites |