Guided Ultrasonics Ltd.
Guided Ultrasonics Ltd. designs, manufactures and supports equipment that uses long range ultrasonics (guided waves) to inspect long lengths of metal pipework.
http://www.guided-ultrasonics.com

Bullen Ultrasonics, Eaton, Ohio (USA)
Bullen Ultrasonics is the technology leader in ultrasonic machining. We have developed and perfected machining methods to match the demands of applications requiring ultrasonic processing. With our considerable experience in precision machining, coupled with our state-of-the-art facilities, we can handle your specific requirements.
http://www.bullen-ultrasonics.com/

Ultrasonics
Covers the entire field of ultrasound research and technology and all its many applications.
http://www.elsevier.com/wps/find/journaldescription.cws_home/525452/description

Berliner Ultrasonics
USA. Consultants to users of ultrasonic welding technology. Personal homepage, containing information on processing and applications, and glossary of terms.
http://home.att.net/~Berliner-Ultrasonics/

Chris Cheers' Power Ultrasonics web site
Independent guide to high power ultrasonics - with a database of industrial suppliers and descriptions of equipment and processes including ultrasonic plastic welding, ultrasonic metal welding, ultrasonic cleaning and sonochemistry.
http://www.powerultrasonics.com

Active Ultrasonics (Switzerland)
Sells frequency generators, transducers, and sonicators. Also offers product development consulting. Page includes applications of merchandise.
http://activeultrasonics.com

PACSYS Ltd
PAFEC software for vibroacoustic analysis
http://www.vibroacoustics.co.uk

IEEE Ultrasonics, Ferroelectrics, and Frequency Control (UFFC)
The theory, technology, materials, and applications related to ultrasound, acoustic signal processing, ultrasound imaging.
http://www.ieee-uffc.org/tr/

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control (TUFFC)
Publishes the theory, technology, materials, and applications related to ultrasound, acoustic signal processing, and ultrasound imaging.
http://www.ieee-uffc.org/tr/

Branson Ultrasonics
Ultrasonic Welding, Plastic Joining, Packaging, Industrial Cleaning, Metal Welding, Medical, Food Processing
http://www.branson-plasticsjoin.com