| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | United Kingdom | 2 | |
| #3 | Belgium | 1 | |
| #4 | France | 1 | |
| #5 | Ireland | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Transport | |
| #3 | Chemical engineering | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Making metal sheets | |
| #2 | Load transportation vehicles | |
| #3 | Soldering, welding and flame cutting | |
| #4 | Separation | |
| #5 | Water-closets with flushing devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Eckhardt Wilhelm | 8 |
| #2 | Wilhelm Eckhardt | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB881602A | Trailer-mounted machine for producing welded tubular bodies; particularly pipes | |
| IE23167L | Production of tubular elements. | |
| GB869021A | Improvements in or relating to the production of tubular bodies | |
| US2991740A | Method and apparatus for shaping flat strips of material into tubular bodies |