| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 3 | |
| #2 | France | 3 | |
| #3 | Italy | 3 | |
| #4 | Canada | 2 | |
| #5 | United Kingdom | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Medical technology | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Operating tables | |
| #2 | Hand carts | |
| #3 | Unspecified technologies | |
| #4 | Cycles | |
| #5 | Vehicle drive control systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Engman Bert | 3 |
| #2 | Udden Per | 3 |
| #3 | Graaf Siegfrid | 2 |
| #4 | Graf Siegfrid | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1011241A | Electrically powered wheel-chair for indoor and outdoor use | |
| GB1463157A | Hand operated wheel-chair |