Patent US 3683225A
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| Patent number | US 3683225A (click link for details and documents via Google Patents) |
|---|---|
| Title | Orange-reflective graticule scale for cathode ray tube |
| Inventors | Marlow Butler |
| Company | Tektronix Inc |
| Filing date | 1970-03-20 |
| Grant date | 1972-08-08 |