Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4801855 | Method and system for controlling chopper | Makoto Nohmi | 1989-01-31 |
| 4799161 | Control apparatus for maintaining traction in electric rolling stock | Tetsuji Hirotsu, Kiyoshi Nakamura, Syoji Kasai, Hiroshi Yamaguchi | 1989-01-17 |