Patent US 4680577A
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| Patent number | US 4680577A |
|---|---|
| Title | Multipurpose cursor control keyswitch |
| Inventors | David H. Straayer, Patrick J. Franz, Eugene F. Lynch |
| Company | Tektronix Inc |
| Filing date | 1986-04-18 |
| Grant date | 1987-07-14 |
| Cites |