Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4805221 | Construction of sound converter in sound guide, especially for loudspeakers, for example speaker boxes | — | 1989-02-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4805221 | Construction of sound converter in sound guide, especially for loudspeakers, for example speaker boxes | — | 1989-02-14 |