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Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object (G 01 N 3/00 to G 01 N 27/00 take precedence; measuring or indicating of ultrasonic, sonic or infrasonic waves in general G 01 H; systems using the reflection or reradiation of acoustic waves, e.g. acoustic imaging, G 01 S 15/00; obtaining records by techniques analogous to photography using ultrasonic, sonic or infrasonic waves G 03 B 42/06) [4] |
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