Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5931601 | Tunnel excavator | Shinichi Terada, Toshihiro Yamazaki, Masaru Nakamura | 1999-08-03 |
| 5915790 | Tunnel boring machine | Takashi Sakai, Sohta Takatsu, Yoshiaki Ishida, Tomio Jatani | 1999-06-29 |
| 5181577 | Device for fixing disk cutter to tunnel excavator | Toshio Tsukamoto | 1993-01-26 |
| 4818026 | Shield type tunneling apparatus | Toshihiro Yamazaki | 1989-04-04 |