Patent US 3701993A
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| Patent number | US 3701993A (click link for details and documents via Google Patents) |
|---|---|
| Title | Ramp generator [for] a chart recorder |
| Inventors | Hans Geerling |
| Company | Tektronix Inc |
| Filing date | 1971-06-28 |
| Grant date | 1972-10-31 |