Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5151683 | Power supply control device in fire alarm system | Kaoru Takahashi, Akio Tsumuji | 1992-09-29 |
| 5086293 | Line interruption supervisory device for a fire alarm system | Kaoru Takahashi, Akio Tsumuji | 1992-02-04 |
| 5083107 | Fire alarm system | Kaoru Takahashi, Akio Tsumuji | 1992-01-21 |
| 4996518 | Fire alarm system | Kaoru Takahashi, Akio Tsumiji | 1991-02-26 |