Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5038082 | Vacuum switch apparatus | Hiroshi Arita, Hiroyuki Sugawara, Yukio Kurosawa | 1991-08-06 |
| D273950 | Audio mixer | Masafumi Itoh, Sigeru Hasegawa, Haruki Takita | 1984-05-22 |
| D273676 | Audio mixer | Masafumi Itoh, Sigeru Hasegawa, Haruki Takita | 1984-05-01 |