An electronic device is provided that functions as an area-intrusion informing embodiment for announcing the unauthorized entry into an enclosure or area which has at least one access opening and closing means. The invention is not intended to replace conventional alarm systems, but to provide its' own...http://www.google.fr/patents/US20060187035?utm_source=gb-gplus-shareBrevet US20060187035 - Access annunciator
Numéro de demande: 11/342,823 Numéro de publication: US 2006/0187035 A1 Date de dépôt: 31 janv. 2006 Brevet délivré: US7239247 ( Date de délivrance 3 juil. 2007)
