Patent US 4804885A
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| Patent number | US 4804885A (click link for details and documents via Google Patents) |
|---|---|
| Title | X-ray attenuating ceramic materials |
| Inventors | Ronald O. Petersen, James L. McAlpin |
| Company | Tektronix Inc |
| Filing date | 1984-08-20 |
| Grant date | 1989-02-14 |