| 3192517 | Burglar alarm | |||
| 3161742 | Magnetic intruder and fire deterctor | |||
| 3155954 | Automatic sensitivity control for sound actuated detection and alarm systems | |||
| 3135953 | Lamp illuminating network | |||
| 3114905 | Alarm system | |||
| 3056951 | Safe alarm system | |||
| 2943308 | Protective alarm system | |||
| 2905762 | Fire and burglar alarm system | |||
| 2899674 | N/A | |||
| 2877361 | Burglar alarm system | |||
| 2766358 | Hold-up alarm signal system | |||
| 2754498 | Alarm device for suspended articles |
| DE1108111B | ||||
| GB669820A | ||||
| GB770958A |