Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816338 | Glassy carbon-coated article | Ryuichi Terasaki, Shinsei Sato, Yoichi Ogata, Yukihiko Nakajima | 1989-03-28 |
| 4811322 | Phonograph for a record disk having a plurality of sound grooves | Eishi Koike | 1989-03-07 |