Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880097 | Park card system for electronic parking meter | — | 1989-11-14 |
| 4872149 | Electronic advertising system for solar powered parking meter | — | 1989-10-03 |
| 4827206 | Solar power system for electronic parking meter | — | 1989-05-02 |
| 4823928 | Electronic parking meter system | — | 1989-04-25 |