Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888684 | Multiprocessor bus protocol | David J. Lilja, Steven W. Wierenga | 1989-12-19 |
| 4800462 | Electrical keying for replaceable modules | Jay A. Zwagerman, Francis J. Dwan | 1989-01-24 |