| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 2 | |
| #2 | New Zealand | 2 | |
| #3 | Argentina | 1 | |
| #4 | Australia | 1 | |
| #5 | Brazil | 1 | |
| #6 | Netherlands | 1 | |
| #7 | Norway | 1 | |
| #8 | Sweden | 1 | |
| #9 | United States | 1 | |
| #10 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Agriculture | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Planting | |
| #2 | Unspecified technologies | |
| #3 | Crop agriculture |
| # | Name | Total Patents |
|---|---|---|
| #1 | Willis R A | 4 |
| #2 | Willis R | 2 |
| #3 | Willis Robert Anthony | 1 |
| #4 | Willis Robert A | 1 |
| Publication | Filing date | Title |
|---|---|---|
| NL7707401A | Agricultural seed spreading hopper - has wiper wheel rims engaging spacer wheel and grooves with seed receptacles | |
| NZ184536A | Seed drilling unit attachd to towing vehicle through parallel linkage front wheel replaceable by coulter | |
| NZ183652A | Seed metering device | |
| GB1524343A | Seed drilling units | |
| GB1552795A | Seed dispensing device |