Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870404 | Sensor device for picket barrier intrusion detection and location system | Claude A. S. Hamrick | 1989-09-26 |
| 4800366 | Alarm locator module for picket barrier intrusion detection and location system | — | 1989-01-24 |