Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4807294 | Piezoelectric and foam resin sheet speaker | Nubuo Tanaka, Junichi Katurayama | 1989-02-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4807294 | Piezoelectric and foam resin sheet speaker | Nubuo Tanaka, Junichi Katurayama | 1989-02-21 |