| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 4 | |
| #2 | United Kingdom | 4 | |
| #3 | Sweden | 3 | |
| #4 | United States | 2 | |
| #5 | Belgium | 1 | |
| #6 | Switzerland | 1 | |
| #7 | France | 1 | |
| #8 | Italy | 1 | |
| #9 | Norway | 1 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Electrophonic musical instruments | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kooij Tijmen Van Der | 3 |
| #2 | Van Der Kooij T | 2 |
| #3 | Van Der Kooy T | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US3833752A | Electronic musical instrument with plural channels providing different phase shift | |
| GB1327214A | Electronic circuit arrangement for imitating a percussion musical instrument | |
| GB1322572A | Electronic rhythm apparatus | |
| US3649736A | Electronic rhythm apparatus for a musical instrument |