Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8720792 | Ballast retaining structure, tool jig, and bedded track | Masaki Seki, Yasuhito Watanabe, Hironari Muramatsu, Junichi Koseki | 2014-05-13 |
| 8240580 | Ballast retaining structure, bedded track | Masaki Seki, Takashi Kachi, Junichi Koseki | 2012-08-14 |