Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4803718 | Hold detecting and control circuit for a key telephone system | James E. Neil, Victor Demjanenko | 1989-02-07 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4803718 | Hold detecting and control circuit for a key telephone system | James E. Neil, Victor Demjanenko | 1989-02-07 |