Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864556 | Synchronization arrangements for a digital telecommunications exchange system | Milan Maric | 1989-09-05 |
| 4858223 | Security arrangement for a telecommunications exchange system | John W. Ansell, Richard N. Waters | 1989-08-15 |