Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852882 | Device for golf practicing | Kazuhiko Otsuka | 1989-08-01 |
| 4846859 | Air cleaner | Yoshiharu Metoku, Hisato Uragami, Toshitaka Tamaki, Keiji Yoshimura, Kazuhiko Otsuka | 1989-07-11 |