Patent US 4831222A
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| Patent number | US 4831222A (click link for details and documents via Google Patents) |
|---|---|
| Title | Integrated pad switch |
| Inventors | Heinz Erwin Grellmann, Leonard A. Roland |
| Company | Tektronix Inc |
| Filing date | 1985-04-29 |
| Grant date | 1989-05-16 |