Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5697676 | Shield tunnel boring machine | Norio Kondo, Masami Inoue | 1997-12-16 |
| 5032039 | Underground excavator | Hakumi Hagimoto, Norio Kondo, Tsutomu Tomisawa, Kiichi Honma | 1991-07-16 |
| 4797031 | Caisson sinking method | Hakumi Hagimoto, Norio Kondo, Masami Inoue | 1989-01-10 |
| 4607889 | Shield tunnel boring machine | Hakumi Hagimoto, Norio Kondo, Masumi Inoue | 1986-08-26 |