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Cedrat Recherche - Ultrasonic linear piezo motors, drives and actuators. Also dedicated piezo transducer software for motor design.

Cranfield University - Nanotechnology - Piezoelectric materials, motors, microsystems (MEMS) and actuator design.

Flexmotor - Motors and Micromotors - Innovative piezoelectric ultrasonic motor and micromotors for low cost, high volume manufacture for automotive, MEMS and consumer products. Low profile piezomotor and scalable to 2mm diameter.

Institute of Piezomechanics - Ultrasonic actuator and motor research in Kaunas, Lithuania from 1970. Multi degree of freedom motors for robotics.

MicroPropulsion Corp (USA) - Ultrasonic motors, piezoelectric transformers, miniature generators.

Piezo Ceramic GmbH (Germany) - Ultrasonic motor manufacturer. Also piezo ceramic, PZT transducers and actuators.

Surface Acoustic Wave Linear Motor - SAW linear motors. Article describing the principle, experiment and conclusions and future reading.

Ultrasonic Motors - JPL's NDEAA Group work for space application of piezo devices up to year 2000 including commercially available motors.