Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5472295 | Shield tunneling method using flexible segments, flexible segments for shield tunneling method, and flexible segments for secondary application of shield tunneling method | Shintaro Ikeda | 1995-12-05 |
| 4449717 | Sealing mechanism for bearings | Masao Annaka | 1984-05-22 |