| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 2 | |
| #2 | Australia | 1 | |
| #3 | Belgium | 1 | |
| #4 | Brazil | 1 | |
| #5 | Canada | 1 | |
| #6 | Switzerland | 1 | |
| #7 | Germany | 1 | |
| #8 | Spain | 1 | |
| #9 | France | 1 | |
| #10 | United Kingdom | 1 | |
| #11 | Italy | 1 | |
| #12 | United States | 1 | |
| #13 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Doors and windows |
| # | Name | Total Patents |
|---|---|---|
| #1 | Zilver Edwin | 3 |
| #2 | Zilver E | 2 |
| #3 | Zilver Edvin | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3934832A | Reel assembly for roller | |
| NL7408719A | Threshold. | |
| NL164740B | Device for raising and lowering a roller blind or the like. |