Patent US 4821220A
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| Patent number | US 4821220A (click link for details and documents via Google Patents) |
|---|---|
| Title | System for animating program operation and displaying time-based relationships |
| Inventors | Robert A. Duisberg |
| Company | Tektronix Inc |
| Filing date | 1986-07-25 |
| Grant date | 1989-04-11 |