4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
  6. Presence or movement only detection
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Infra-sonic detector and alarm with self adjusting reference

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Infra-sonic detector and alarm with self adjusting reference

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Interference avoidance device for use in a sensor system

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Intrusion alarm system for use with two-wire-cable

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Intrusion detection apparatus

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Intrusion detection method and apparatus

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Intrusion detection method and apparatus

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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