4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
  6. Presence or movement only detection

Robert A. Leverance

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Credential tracking system

Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent

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Near ultrasonic pattern comparison intrusion detector

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

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Profile ID: LFUS-PAI-P-1055641

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