Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4204176 | Variable equalizer | Yasuhiro Kita, Junichi Nakagawa, Kohei Ishizuka | 1980-05-20 |
| 4187479 | Variable equalizer | Kohei Ishizuka, Yasuhiro Kita, Yoshinori Nagoya, Takeo Kusama | 1980-02-05 |