专利名称：INTRUSION DETECTION SYSTEM发明人：FOREMAN D,US申请号：US37310573申请日：19730625公开号：US38461A公开日：19741029
摘要：An improved intrusion detection system operating in either ultrasonic orelectromagnetic wavelengths using a single transducer, which distinguishes betweenintruder movement toward the transducer or away from it, and gives no alarm unlessintruder movement has a net component of approach or retreat.
申请人：HONEYWELL INC,US
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