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Super Directional Loudspeaker Ultrasonic Sound Speaker - China Ultrasonic Speaker, Directional Speaker | Made-in-China.com
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Soundlazer "Snap" - The Directional Parametric Speaker by Richard Haberkern — Kickstarter
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Neurotechnology Introduces Focusonics Ultrasonic Directional Speaker
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ELTEM / PROPA-U100 / Directional Loudspeaker, Super Directional Speaker, Ultrasonic Speaker, Directional Sound System for Museums, Exhibits, Art Gallery and Digital Signage – Black : Amazon.ca: Electronics
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