Patent US 4947254A
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| Patent number | US 4947254A |
|---|---|
| Title | Layered mix effects switcher architecture |
| Inventors | John Abt, Richard S. Bannister |
| Company | The Grass Valley Group, Inc. |
| Filing date | 1989-04-27 |
| Grant date | 1990-08-07 |
| Cites |