Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845792 | Two-part adjustable approach ramp | Donald J. Caldwell, Andrzej J. Dlugolecki | 1989-07-11 |
| D299910 | Engine analyzer | Donald W. Doman, Raymond R. Zuzinec, Sr., Thomas J. Christensen, Jack A. Parise | 1989-02-21 |