Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D300320 | Telephone attendant console | Toshihiko Watanabe, Hideji Takemasa | 1989-03-21 |
| 4812669 | Harmonic suppressing device | Masatoshi Takeda, Yoshiharu Tominaga, Kenji Mori | 1989-03-14 |