Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4803427 | Precision measuring gauge having sonic delay line with free-standing mode converter armature | Leif Andreasen | 1989-02-07 |
| 4246444 | Telephone handset acoustic coupling cup | — | 1981-01-20 |