Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870231 | Contact for vacuum interrupter | Mitsuhiro Okumura | 1989-09-26 |
| 4827289 | Thermal head | Shiro Tsuji, Takashi Yamanaka, Yoshihiro Usui, Hiroshi Ito, Noriyuki Hasebe | 1989-05-02 |