Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4785916 | Call registration and acknowledgement system for an elevator and method of testing such system | — | 1988-11-22 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4785916 | Call registration and acknowledgement system for an elevator and method of testing such system | — | 1988-11-22 |