Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4785579 | Circular door operating method and apparatus | Keizo Fujii, Shigemitsu Shimoyama | 1988-11-22 |
| 4708695 | Automatic tension adjusting mechanism for winding and transmitting device for automatic door | — | 1987-11-24 |