| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 4 | |
| #2 | Belgium | 3 | |
| #3 | United Kingdom | 3 | |
| #4 | Switzerland | 2 | |
| #5 | Germany | 2 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Civil engineering | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | General building constructions | |
| #2 | Electrically-conductive connections | |
| #3 | Nails | |
| #4 | Lighting device details | |
| #5 | Special light sources | |
| #6 | Non-portable lighting devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | V Heybroek-Zelander N | 1 |
| #2 | Nifterik Bertus Hendrik Van | 1 |
| #3 | Heybroek Carel | 1 |
| #4 | Bertus Hendrik Van Nifterik | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB973117A | Improvements in a framework for a suspended ceiling | |
| DE1159156B | Lattice-shaped supporting framework for a suspended ceiling and butt joints of the bars of the supporting framework | |
| DE1065088B | Crown body for pendant lights | |
| GB740261A | Improvements in and relating to holders for electric lighting tubes |