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Ultrasound is cyclic sound pressure with a frequency of 20 kilohertz or over, greater than the upper limit of human hearing.

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Hopkins Medical Products

http://www.hopkinsmedicalproducts.com/

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C-Pak

http://www.cpak.co.uk/

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Sanofi-Synthelabo Inc.

http://www.sanofi-synthelabo.us/

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ATRION Corporation

http://www.atrioncorp.com/

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Arrow International, Inc.

http://www.arrowintl.com/

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Henan Medical

http://www.henanmedical.com/

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Medical Arts Chemists & Surgical Supplies

http://www.medarts.biz/

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Pla Electro Appliances Pvt. Ltd.

http://www.plaelectro.com/

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Bono Music Musician Matching Center

http://www.bonomusic.com/

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Stetson University: Sociology and Anthropology

https://www.stetson.edu/artsci/sociology/

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