Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4812729 | Protecting apparatus for secondary excitation type variable speed AC generator/motor | Akio Ito, Hiroshi Sugisaka, Shigeaki Hayashi, Hiroto Nakagawa, Yasuteru Oono +1 more | 1989-03-14 |