Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845412 | Speed control apparatus for motor | — | 1989-07-04 |
| 4833930 | Method of sampling steel material and a device therefor | Kaizo Okamoto, Akimune Sato, Kenji Hirata, Katsuhisa Hirayama, Eiji Hina +4 more | 1989-05-30 |