Patent US 4581639A
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| Patent number | US 4581639A (click link for details and documents via Google Patents) |
|---|---|
| Title | Method and apparatus for monitoring suitability of a transmission path for transmission of digital data signals |
| Inventors | John L. Judge |
| Company | Tektronix Inc |
| Filing date | 1983-10-17 |
| Grant date | 1986-04-08 |