| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 3 | |
| #2 | United Kingdom | 3 | |
| #3 | Austria | 2 | |
| #4 | Denmark | 2 | |
| #5 | Canada | 1 | |
| #6 | Spain | 1 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Sound-producing devices | |
| #2 | Special electric heating or lighting |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rydberg Helge Sven Albert | 8 |
| #2 | Sven Albert Rydberg Helge | 3 |
| Publication | Filing date | Title |
|---|---|---|
| GB129237A | Improvements in or relating to Fluid Pressure Operated Diaphragm Horns. | |
| GB112269A | Improvements in Electric Arc Lamps. | |
| GB108305A | Improvements in Diaphragm Vibrators or Sounders. | |
| CA199003A | Arc lamp |