Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877179 | Farebox security device | Wesley A. Golland, Paul A. Mullens, Roger B. Trimble | 1989-10-31 |
| 4796657 | Zone selector and locking mechanism for sequencing valve | — | 1989-01-10 |