| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 3 | |
| #2 | Australia | 2 | |
| #3 | Canada | 2 | |
| #4 | Switzerland | 2 | |
| #5 | Germany | 2 | |
| #6 | United Kingdom | 2 | |
| #7 | Ireland | 2 | |
| #8 | Italy | 2 | |
| #9 | Netherlands | 2 | |
| #10 | Sweden | 2 | |
| #11 | United States | 2 | |
| #12 | Austria | 1 | |
| #13 | Japan | 1 |
| # | Industry | |
|---|---|---|
| #1 | Textiles and paper | |
| #2 | Electrical machinery and energy | |
| #3 | Mechanical elements | |
| #4 | Computer technology | |
| #5 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Typewriters | |
| #2 | Mechanically computing digital computers | |
| #3 | Electric switches | |
| #4 | Unspecified technologies | |
| #5 | Clutches and brakes | |
| #6 | Gearing | |
| #7 | Dynamo-electric machines | |
| #8 | Electric digital data processing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Walker Alexander D R | 8 |
| #2 | Walker A D R | 2 |
| #3 | Arekusandaa Dee Aaru Uookaa | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4036067A | Integral revolution clutch | |
| IE40597L | Dot matrix printer | |
| DE2455058A1 | Data input keyboard for calculators etc. - has elongated springs aligned with apertures in keyboard surface | |
| IT1023316B | Data input keyboard for calculators etc. - has elongated springs aligned with apertures in keyboard surface | |
| CA1009197A | Keyboard | |
| IE40123B1 | Electric switch keyboard | |
| US3879602A | Keyboard |