Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5221160 | Subterranean connecting method for construction of shield tunnel and connecting apparatus therefor | Youji Azuma, Hisao Arai, Kazuo Isaka, Hiroyuki Kubo, Tohru Goto +13 more | 1993-06-22 |