Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5615976 | Double walled pipe, jacking method and pipe end structure of leading pipe | Tomoya Fujimoto, Shigeru Morishita, Masaru Murakami, Akira Adachi, Mitsutoshi Hayashi +4 more | 1997-04-01 |