Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9551190 | Excavation tool | Yoneo Hiwasa, Kazuyoshi Nakamura | 2017-01-24 |
| 9428964 | Excavating tool | Kazuyoshi Nakamura | 2016-08-30 |
| 8550191 | Digging tool, digging bit, and device | Yoneo Hiwasa, Kazuyoshi Nakamura | 2013-10-08 |
| 8430977 | Hollow drilling steel rod and method of manufacturing the same | Yoneo Hiwasa, Satoshi Nagase, Noritaka Takahata | 2013-04-30 |
| 7942216 | Drill rod, drill bit, and drilling tool | Masahiro Koizumi, Takashi Suzuki | 2011-05-17 |