Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5602739 | Vehicle tracking system incorporating traffic signal preemption | Jeffrey D. Haagenstad, Steven M. Hamer, Ronald Allen Hagen, Edmund J. Ring, Theodore B. Keyes | 1997-02-11 |