Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843939 | Apparatus for adjusting height of piano pedal | — | 1989-07-04 |
| 4831608 | Multi-layer high density information recording carrier having a non-alkali inorganic glass protective layer | Nagayoshi Tsukane | 1989-05-16 |