| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 2 | |
| #2 | Denmark | 2 | |
| #3 | Norway | 2 | |
| #4 | Switzerland | 1 | |
| #5 | Finland | 1 | |
| #6 | France | 1 | |
| #7 | United Kingdom | 1 | |
| #8 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Pipes | |
| #2 | Installations for obtaining water | |
| #3 | Sewers | |
| #4 | Testing of structures |
| # | Name | Total Patents |
|---|---|---|
| #1 | Swaerd F | 3 |
| #2 | Lage Swaerd Fritz | 2 |
| #3 | Svaerd F | 1 |
| #4 | Tage Swaerd | 1 |
| #5 | Sward F | 1 |
| #6 | Svaerd Fritz Tage | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE1773729A1 | Device for testing the tightness of individual sections of pipelines | |
| GB1034243A | Concrete ring and arrangement for connecting such concrete rings |