Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4272114 | Impact absorbing device | Tomoyuki Hirano, Akira Yamanaka | 1981-06-09 |
| 4190276 | Deformable impact absorbing device for vehicles | Tomoyuki Hirano, Akira Yamanaka | 1980-02-26 |