Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4629362 | Shield tunneling machine | Norio Kainuma, Takashi Sakuraya, Akira Tanaka | 1986-12-16 |
| 4185158 | Apparatus for electric furnace capable of effecting electrode connection and refractory lining repairs independently of each other | Minoru Koga | 1980-01-22 |