Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6012477 | Circulating drainage system for sewage pipe installation work | Hideo Hagiwara | 2000-01-11 |
| 5996621 | Circulating drainage system for sewage pipe installation work | Hideo Hagiwara | 1999-12-07 |