| Nš of Patent |
Device |
Concession
year |
| 8903396 |
|
1990 |
| 9100912 |
|
1994 |
| 9400354 |
Intrinsec safety lamp, based in LEDs |
1997 |
| 9801719 |
|
2001 |
| 9801718 |
|
2003 |