|
| US4131888 | 18 août 1976 | 26 déc. 1978 | American District Telegraph Company | Dual projected-beam smoke detector |
| US4316184 | 27 juil. 1979 | 16 févr. 1982 | Pittway Corporation | Combination combustion-products detector |
| US4401978 | 1 mai 1981 | 30 août 1983 | The Gamewell Corporation | Combination detector |
| US4438431 | 12 mai 1981 | 20 mars 1984 | Canon Kabushiki Kaisha | Electronic device having warning means |
| US4482891 | 21 sept. 1981 | 13 nov. 1984 | | Robust electronic liquid level gauge |
| US5293980 | 5 mars 1992 | 15 mars 1994 | | Coin analyzer sensor configuration and system |