| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 21 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications | |
| #2 | Electrical machinery and energy | |
| #3 | Control | |
| #4 | Transport | |
| #5 | Audio-visual technology | |
| #6 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Telephonic communication | |
| #2 | Selecting | |
| #3 | Vehicle signalling and lighting | |
| #4 | Alarm systems | |
| #5 | Electric switches | |
| #6 | Loudspeakers and microphones | |
| #7 | Transmission systems | |
| #8 | AC and DC conversion devices | |
| #9 | Optical systems | |
| #10 | Waveguides |