Ultrasonic motor

https://www.wikidata.org/wiki/Q10541502

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Physics 31.7M papers	Engineering 23.9M papers	Materials science 18.2M papers	Quantum mechanics 13.1M papers
Composite material 8.6M papers	Mechanical engineering 5.3M papers	Electrical engineering 4.7M papers	Acoustics 2.8M papers
Vibration 417k papers		Piezoelectricity 112k papers
Current
Ultrasonic motor 4,299 papers
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