| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 11 | |
| #2 | Canada | 1 | |
| #3 | Finland | 1 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Shaping clay |
| # | Name | Total Patents |
|---|---|---|
| #1 | Olav Nielsen | 1 |
| #2 | David Livingston William | 1 |
| #3 | Nielsen Olav | 1 |
| #4 | Frank King Ronald | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2524676A | Machine for molding hollow concrete products | |
| CA464682A | Arrangement in machines for the casting of pipes and other hollow bodies |