Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5634740 | Large-depth underground drainage facility and method of running same | Kunio Takada, Masayuki Yamada, Saburo Maru, Sumio Sudo, Sadashi Tanaka | 1997-06-03 |
| 5603587 | Drainage water pumping station and method for operating the same | Kunio Takada, Sadashi Tanaka | 1997-02-18 |