Patent US 4825339A
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| Patent number | US 4825339A (click link for details and documents via Google Patents) |
|---|---|
| Title | Sheet metal knock-out |
| Inventors | Douglas M. Boudon, Jim Gottsch |
| Company | Tektronix Inc |
| Filing date | 1988-01-11 |
| Grant date | 1989-04-25 |