Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5475559 | Negative-sequence time-overcurrent relay | Kazuhiro Suzuki, Yoshitaka Sakai | 1995-12-12 |
| 4602132 | Key telephone system | Kazuyuki Nagatomi | 1986-07-22 |
| 4595800 | Key telephone system | Kazuyuki Nagatomi | 1986-06-17 |