Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872199 | Battery-feed circuit for exchange | Takashi Tabu, Shigeo Sano, Nobuyuki Masuda | 1989-10-03 |
| 4677669 | Battery feed circuit for a pair of subscriber lines | Takashi Tabu, Mitsutoshi Ayano, Kiyoshi Shibuya, Shin Itoh | 1987-06-30 |