| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 6 | |
| #2 | Australia | 1 | |
| #3 | Canada | 1 | |
| #4 | EPO (European Patent Office) | 1 | |
| #5 | Republic of Korea | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Foundations and excavations | |
| #2 | Unspecified technologies | |
| #3 | Machines for making railways |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hoaki Koji | 5 |
| #2 | Hoaki Kouji | 4 |
| #3 | Kouji Hoaki | 1 |
| #4 | Yamashita Mitsuya | 1 |
| Publication | Filing date | Title |
|---|---|---|
| EP0319204A1 | Method and apparatus for removing old piles | |
| JPH01207524A | Removal of existing pile and device thereof | |
| JPH01207525A | Digging of pile hole to remove existing pile and dig pile hole for new pile and device thereof | |
| JPH01146016A | Method and device for removing existing piles | |
| JPS626066A | Repairing of concrete structure | |
| JPS61186672A | Repairing pin of concrete structure | |
| JPS5915103A | Track foundation improving vehicle |