Patent US 4608690A
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| Patent number | US 4608690A (click link for details and documents via Google Patents) |
|---|---|
| Title | Detecting improper operation of a digital data processing apparatus |
| Inventors | John L. Judge |
| Company | Tektronix Inc |
| Filing date | 1985-06-10 |
| Grant date | 1986-08-26 |