Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5594223 | Vacuum switch bulb type change over switch for on-load tap changer | Tomio Yamaguchi | 1997-01-14 |
| 5488212 | Switching device for an on-load tap changer | Tomio Yamaguchi | 1996-01-30 |