| http://www.w3.org/ns/prov#value | - Wave generating means 54 comprises (1) a crystal 55 for creating longitudinal, ultrasonic waves which impinge on the interior surface and are transmitted as surface waves at different depths through the walls of conduit 50 and (2) a means 61 for measuring the wall thickness of the tube and/or defects inside of the tube, such as an eddy current generating means or a means for generating ultrasonic
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