Patent US 4223083A
| Patent number | US 4223083A (click link for details and documents via Google Patents) |
|---|---|
| Title | Virtual mask exposure system for CRT screen manufacture |
| Inventors | Frederic R. Engstrom |
| Company | Tektronix Inc |
| Filing date | 1977-12-27 |
| Grant date | 1980-09-16 |