| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 14 | |
| #2 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Audio-visual technology | |
| #3 | Basic materials chemistry | |
| #4 | Basic communication technologies |
| # | Technology | |
|---|---|---|
| #1 | Radio navigation | |
| #2 | Loudspeakers and microphones | |
| #3 | Acetylene production | |
| #4 | Tuning resonant circuits | |
| #5 | Fuels |
| # | Name | Total Patents |
|---|---|---|
| #1 | Lefebvre Andre | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB486514A | Improvements relating to electro-dynamic loudspeakers and the like |