Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818935 | Method and apparatus for non-destructively detecting defects in metal materials by using rotating magnetic fields generated by multiphase ac current | Michiaki Takahashi, Mitsuo Yoshida, Kazuyoshi Miyazawa, Junichi Fujisawa, Nobuji Obara +2 more | 1989-04-04 |