Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5211507 | Method of making a huge elongated space of square or rectangular cross section under the ground | Ayao Siseki, Koji Tada, Toru Taniguchi, Masahiro Nakagawa, Yuji Tachikawa | 1993-05-18 |