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| Number | Title | Issue Date |
| 7298254 | Alarm system employing single transmission line In the present invention an intrusion detection system comprises a detection element configured to detect an intrusion in a location, and to transmit an intrusion signal upon detection of the intrusion. The system further comprises a monitoring device configured to ... | 11/20/2007 |
| 7115871 | Field coverage configurable passive infrared radiation intrusion detection device One embodiment of a field coverage configurable passive infrared radiation intrusion detection device comprises a plurality of passive infrared radiation sensors. The device also has an optical element for gathering infrared radiation from different portions of a fi... | 10/03/2006 |
