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Piezoelectric devices|Transducers|Radiology apparatus (medical)|Bibliography|Acoustic waves|Voltage measurement|Acoustic measurement|Ultrasonic medical apparatus|Ultrasonic frequencies|Spark-gap apparatus|Position|Electromagnetically-operated devices|Testing conditions|Pressure|Hydrophones|Probes|Ultrasonics|Formulae (mathematics)|Medical equipment|Waveforms|Test equipment|Acoustic equipment