Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4804295 | Shielded tunnel excavator | — | 1989-02-14 |
YK
Yasunori Kondo
Overall (1989): #42,059 of 140,708Top 30%
1
Patents 1989