Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5146689 | Key reading method and apparatus | — | 1992-09-15 |
| 4415893 | Door control system | Manfred W. Roland | 1983-11-15 |
| 4283859 | Method and apparatus for reading a key | — | 1981-08-18 |