| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 6 | |
| #2 | Austria | 2 | |
| #3 | Canada | 1 | |
| #4 | Switzerland | 1 | |
| #5 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Control | |
| #3 | Machines | |
| #4 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Dredging | |
| #2 | Systems controlling non-electric variables | |
| #3 | Unspecified technologies | |
| #4 | Hydraulic engineering | |
| #5 | Horticulture |
| # | Name | Total Patents |
|---|---|---|
| #1 | Willner Kurt | 8 |
| Publication | Filing date | Title |
|---|---|---|
| DE2519642A1 | Plough beds for cable type laying - has shares on both sides whose cutting edges are arranged at acute angle to direction of cut | |
| DE2002225A1 | Plastic drain pipe with filter medium coated walls | |
| CA654482A | Methods of and means for laying drainage material in the ground |