Issued Patents All Time
Showing 26–36 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869619 | Method for excavating hole and apparatus therefor | — | 1989-09-26 |
| 4830539 | Pipe propelling apparatus | — | 1989-05-16 |
| 4815695 | Pipe propelling device | — | 1989-03-28 |
| 4691787 | Earth auger | — | 1987-09-08 |
| 4692062 | Shield type tunneling machine | — | 1987-09-08 |
| 4662606 | Pipe propelling device | — | 1987-05-05 |
| 4630869 | Shield tunneling machine | Kenju Suzuki, Toshio Sumi | 1986-12-23 |
| 4624605 | Shield tunneling apparatus | — | 1986-11-25 |
| 4406498 | Shield tunneling method and machine therefor | — | 1983-09-27 |
| 4311411 | Pipe jacking apparatus | Takeshi Hada | 1982-01-19 |
| 4311344 | Shield-type tunneling machine with toggle controlled bit plates in cutter disc | — | 1982-01-19 |