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

John F. Zeigler, III

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Automatic gray scale control circuit for a color television rece

Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent

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Ultrasonic intrusion alarm system

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

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Profile ID: LFUS-PAI-P-617135

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