Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4700186 | Radio wave signal controlled door lock arrangement | Kiyohiko Fujino, Hirotoshi Namazue, Shunsaku Tsutsumi, Satoru Kobayashi, Keiichi Shimizu | 1987-10-13 |
| 4603563 | Magnetic door locking system | Haruo Mochida, Keiichi Shimizu | 1986-08-05 |