Issued Patents 2021
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11084155 | Hydraulic striking device | — | 2021-08-10 |
| 11072977 | Two-piston hydraulic striking device | Masahiro Koizumi | 2021-07-27 |
| 11034010 | Hydraulic hammering device | Tsutomu Kaneko, Masahiro Koizumi | 2021-06-15 |