| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 7 | |
| #2 | Germany | 2 | |
| #3 | Belgium | 1 | |
| #4 | Netherlands | 1 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Dredging | |
| #2 | Construction of roads |
| # | Name | Total Patents |
|---|---|---|
| #1 | Masquelier Henry | 2 |
| Publication | Filing date | Title |
|---|---|---|
| FR2556380A1 | Method for draining a grass | |
| FR2556381A1 | Natural grass field | |
| DE2825199A1 | DEVICE FOR DIGGING | |
| US4197036A | Apparatus for forming narrow drainage trenches | |
| DE2725861A1 | Rotary disc tractor drawn trencher - has disc with alternately laterally projecting blades and conveyor ejecting soil |