Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870460 | Method of controlling surface potential of photoconductive element | Kazuhiro Kimura | 1989-09-26 |
| 4825765 | Delay circuit for electric blasting, detonating primer having delay circuit and system for electrically blasting detonating primers | Koji Ochi | 1989-05-02 |