4. Communications, electrical: acoustic wave systems and devices
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Security door with improved sensor for detecting unauthorized pa

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

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Security door with improved sensor for detecting unauthorized pa

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

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Sensor for detecting moving object with the aid of a...

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

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Sonic identification system and method

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

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Space surveillance apparatus with sound source and method of sho

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

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Surveillance system in which a reflected signal pattern is compa

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

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Swimming pool intrusion alarm system

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

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