| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 7 | |
| #2 | United Kingdom | 4 | |
| #3 | Germany | 1 | |
| #4 | Italy | 1 | |
| #5 | Netherlands | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Measurement | |
| #3 | Control | |
| #4 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Spark gaps and corona devices | |
| #2 | Measuring mechanical vibrations | |
| #3 | Separating solids | |
| #4 | Electrically-conductive connections | |
| #5 | Alarm systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Boulard Raymond | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB2015643A | Sparking plug | |
| GB536358A | Improvements in and relating to spark plugs | |
| GB433417A | Sound reproducing device for lorries, tractors or other heavy vehicles | |
| GB307941A | Improvements in and relating to sparking plug electrodes | |
| DE517869C | Device for chrome-plating electrical conductors, especially spark plug electrodes |