Patent US 4947255A
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| Patent number | US 4947255A |
|---|---|
| Title | Video luminance self keyer |
| Inventors | Richard A. Jackson, Richard S. Bannister |
| Company | The Grass Valley Group, Inc. |
| Filing date | 1988-09-19 |
| Grant date | 1990-08-07 |
| Cites |