| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 255 | |
| #2 | Germany | 1 | |
| #3 | France | 1 | |
| #4 | United Kingdom | 1 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Agriculture | |
| #2 | Civil engineering | |
| #3 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Crop agriculture | |
| #2 | Dredging | |
| #3 | Motor vehicles | |
| #4 | Earth drilling | |
| #5 | Load transportation vehicles | |
| #6 | Vehicle wheels | |
| #7 | Planting |
| # | Name | Total Patents |
|---|---|---|
| #1 | Minagawa Isao | 257 |
| #2 | Minagawa Toshio | 123 |
| #3 | Iioka Takeshi | 123 |
| #4 | Iioka Tsuyoshi | 1 |
| Publication | Filing date | Title |
|---|---|---|
| JP2002335703A | Ridge-preparing machine | |
| JP2002078404A | Levee arranging machine | |
| JPH1070903A | Land grader for field | |
| JPH08256508A | Levee former | |
| JPH08256507A | Levee former | |
| JPH0898604A | Ridging machine | |
| JPH0898603A | Ridging machine | |
| JPH08191604A | Levee-trimming machine | |
| JPH08191603A | Levee-trimming machine | |
| JPH08112004A | Well-ordered levee-arranging machine | |
| JPH0837803A | Levee-shaping machine | |
| JPH0823704A | Levee trimming machine | |
| JPH0813530A | Excavator for waterway | |
| JPH07322704A | Levee-building machine | |
| JPH07259124A | Excavator for waterway | |
| JPH07259125A | Excavator for waterway | |
| JPH07194203A | Lister | |
| JPH07197484A | Excavation machine for channel | |
| JPH07194202A | Lister | |
| JPH07132002A | Levee making apparatus |