Patent US 4952919A
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| Patent number | US 4952919A (click link for details and documents via Google Patents) |
|---|---|
| Title | Trackball mechanism |
| Inventors | Reuben E. Nippoldt |
| Company | Tektronix Inc |
| Filing date | 1989-04-06 |
| Grant date | 1990-08-28 |