Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882956 | Emergency Hammer | — | 1989-11-28 |
| 4799031 | Waveguide device for producing absorption or attenuation | Walter Hoppler | 1989-01-17 |
| D299304 | Espresso machine | Michael Knochner | 1989-01-10 |