Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D305121 | Hands-free intercommunication instrument | Herbert Pfeifer, Paul Montgomery | 1989-12-19 |
| D304940 | Combination telecommunication set | Herbert Pfeifer, Paul Montgomery | 1989-12-05 |