Patent US 3512427A
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| Patent number | US 3512427A (click link for details and documents via Google Patents) |
|---|---|
| Title | Pushbutton rotary control apparatus for an electrical switch and the like |
| Inventors | Bob Metcalf |
| Company | Tektronix Inc |
| Filing date | 1968-06-11 |
| Grant date | 1970-05-19 |