| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 7 | |
| #2 | United Kingdom | 5 | |
| #3 | France | 3 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Mechanical elements | |
| #3 | Electrical machinery and energy | |
| #4 | Control |
| # | Technology | |
|---|---|---|
| #1 | Sound-producing devices | |
| #2 | Alarm systems | |
| #3 | Venting or aerating devices | |
| #4 | Special electric heating or lighting | |
| #5 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rydberg Helge Sven Albert | 3 |
| Publication | Filing date | Title |
|---|---|---|
| GB334835A | Improvements in or relating to hydro- or aero-dynamic oscillation systems and apparatus | |
| GB207205A | Improvements in acoustical signalling apparatus | |
| GB184052A | Improvements in or relating to membranes for use in acoustic instruments | |
| GB186668A | Improvements in valves | |
| GB168419A | Improvements in or relating to hydraulic or other liquid compensators for reducing shocks |