| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Norway | 2 | |
| #2 | Australia | 1 | |
| #3 | Denmark | 1 | |
| #4 | EPO (European Patent Office) | 1 | |
| #5 | Spain | 1 | |
| #6 | Finland | 1 | |
| #7 | Portugal | 1 | |
| #8 | Russian Federation | 1 | |
| #9 | United States | 1 | |
| #10 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Furniture and games |
| # | Technology | |
|---|---|---|
| #1 | Nails | |
| #2 | Office furniture |
| # | Name | Total Patents |
|---|---|---|
| #1 | Birkeland Kirsten | 10 |
| #2 | Birkeland Osvald | 10 |
| Publication | Filing date | Title |
|---|---|---|
| RU1782160C | Furniture-assembly wall | |
| ES2017892A6 | Interior ironwork (iron-fitting) system | |
| PT92566A | Interior mortising (dovetailing) device | |
| AU3775289A | Wall paneling system |