| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Netherlands | 4 | |
| #2 | Germany | 3 | |
| #3 | Denmark | 2 | |
| #4 | Spain | 2 | |
| #5 | France | 2 | |
| #6 | Italy | 2 | |
| #7 | United Kingdom | 1 | |
| #8 | Norway | 1 | |
| #9 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Electric switches |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hielckert Humphrey Douglas Arc | 4 |
| #2 | Hielckert H D A | 3 |
| #3 | Veltink Hendrik | 1 |
| #4 | Hielckert Humphry Douglas Arch | 1 |
| Publication | Filing date | Title |
|---|---|---|
| IT7852366D0 | Safety mechanism for switchgear - has triangular pivoting link mechanism with setting and cut=out contact elements | |
| ES475402A1 | Safety mechanism for switchgear - has triangular pivoting link mechanism with setting and cut=out contact elements | |
| DE2756237A1 | SYSTEM FOR THE PROTECTION OF ELECTRICAL EQUIPMENT IN A BUILDING | |
| DE2416995A1 | SCREW CARTRIDGE CASE FOR RAIL MOUNTING |