Title:
System for signalling unauthorized displacement of an article
United States Patent 3247502
Publication Date:
04/19/1966
Assignee:
Sonnenschein, Accumulatoren
Other Classes:
200/52R, 340/333, 340/547, 340/568.800, 340/539.310, 335/206
International Classes:
G08B13/08; G08B13/14; H01H36/00; G08B13/02
US Patent References:
| 2943308 | Protective alarm system | | | |
| 3056951 | Safe alarm system | | | |
| 3114905 | Alarm system | | | |
| 3135953 | Lamp illuminating network | | | |
| 3155954 | Automatic sensitivity control for sound actuated detection and alarm systems | | | |
| 3161742 | Magnetic intruder and fire deterctor | | | |
| 3192517 | Burglar alarm | | | |
Foreign References:
| DE1108111B | | | | |
| GB669820A | | | | |
| GB770958A | | | | |