Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866569 | Gas-insulated switchgear apparatus | Kazuaki Oishi | 1989-09-12 |
| 4864286 | Switch operation monitoring apparatus | Youichi Ohshita, Akira Hashimoto, Masanori Tsukushi, Yukio Kurosawa | 1989-09-05 |