Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870339 | Variable-speed power generating system | Yasuhiro Yasaka, Osamu Nagura, Eiji Haraguchi, Hiroto Nakagawa, Yasuteru Oono | 1989-09-26 |
| 4812730 | Variable-speed generator/motor system | Hiroto Nakagawa, Yasuteru Oono, Tadaatsu Kato, Osamu Nagura, Sadahiko Niwa +1 more | 1989-03-14 |