Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869347 | Speed control apparatus for elevators | Hideaki Takahashi | 1989-09-26 |
| 4852694 | Elevator starting compensation method and apparatus | Hideaki Takahashi, Yoshio Sakai, Kenji Yoneda | 1989-08-01 |