Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4897513 | Rotary switch | Tsumoru Oka | 1990-01-30 |
| 4824396 | Electrical connection apparatus | Kunihiko Sasaki, Kiichi Yamaguchi, Tsumoru Oka, Takasi Ohya, Akihiro Konno +1 more | 1989-04-25 |