Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4323734 | Interface circuit for telephone line to equipment signal coupling | — | 1982-04-06 |
| 4228324 | Key telephone system having interstation signalling during hold condition | Harry R. Rasmussen | 1980-10-14 |
| 4218590 | Key telephone system having automatic exclusion circuit for line privacy | Harry R. Rasmussen | 1980-08-19 |