Patent US 3617881A
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| Patent number | US 3617881A (click link for details and documents via Google Patents) |
|---|---|
| Title | Dc voltage-testing and current-measuring circuit including differential amplifier |
| Inventors | John McCormick |
| Company | Tektronix Inc |
| Filing date | 1969-11-24 |
| Grant date | 1971-11-02 |