Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4323735 | Key telephone line shunt detector circuit | Alan M. Gordon | 1982-04-06 |
| 4311880 | Key telephone hold arrangement | Alan M. Gordon, Michael Leibowitz, Karl Wittig | 1982-01-19 |