| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | United Kingdom | 5 | |
| #3 | France | 2 | |
| #4 | United States | 2 | |
| #5 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Transport | |
| #3 | Mechanical elements |
| # | Name | Total Patents |
|---|---|---|
| #1 | Stephen Grebel | 3 |
| #2 | Grebel Stephen | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB444560A | Improvements in electric incandescent lamps | |
| GB422030A | Improvements in searchlights | |
| GB360190A | Improvements in lamps mainly intended for use as aircraft landing lights but also applicable to head-lights for motor vehicles | |
| GB291060A | Improvements in projectors for illuminating purposes | |
| US1744222A | Projector | |
| GB210504A | Improvements in lamps for vehicles | |
| US1499651A | Searchlight | |
| DE407068C | Headlights |