Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5707176 | Earth discharge control system for small-diameter pipe propelling machine | — | 1998-01-13 |
| 4797574 | Synchronizing circuit | Masataka Hirasawa | 1989-01-10 |
| 4555064 | Pebble-stone crushing device for use in excavator for laying pipelines underground | Juichi Asano, Hiroshi Saito, Shigeru Harada | 1985-11-26 |