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Access alarming method and apparatus for working vehicle

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

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Acoustic object detection system and method

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

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Acoustic pool monitor with sequentially actuated multiple transd

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

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Acoustic reflectometer for sheet feed sensing

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

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Acoustically monitored shopper traffic surveillance and security

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

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Acoustically monitored site surveillance and security system for

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

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Alarm system responsive to intrusion induced phase unbalance

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

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Apparatus for and method of doppler motion detection with standi

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
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Apparatus for and method of doppler motion detection with standi

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
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Apparatus for detecting objects

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

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Apparatus for detecting the discharge of a firearm and transmitt

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

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Area intrusion adjustable detector unit

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

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Area surveillance system

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

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Automatic detection and classification device

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

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Automatic echo detection and classification system

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

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Automatic level sensing system

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

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Automatic sensitivity level adjustment

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

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Circuit arrangement for ultrasonic burglar security systems oper

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

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Circuit arrangement of an ultrasonic-presence motion detector, p

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

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Coded acoustic alarm transmitter/receiver system

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