Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4618298 | Method for constructing an enlarged tunnel and apparatus for forming the same | Kazutoshi Inoue, Kenzo Tsutaya | 1986-10-21 |
| 4558906 | Shield machine | Toshio Furuta | 1985-12-17 |