| http://www.w3.org/ns/prov#value | - rasonic wave level regulating mechanism used in the immersion type automatic ultrasonic testing apparatus for detecting flaws of ballsaccording to this invention.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTSThe ball as the material to be tested, namely, the object of the ultrasonic testing according to this invention is a ball used for a structural member, a wear-resistant member or a sliding
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