Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4839767 | Element and device for detecting internal faults in an insulating gas charged electrical apparatus | Takeo Yoshioka, Tadao Minagawa, Toshihiro Suzuki, Ichiro Yamasaki | 1989-06-13 |