| http://www.w3.org/ns/prov#value | - he ultrasonic response waveform in the case where there is a flaw such as an inclusion or lamination in the vessel steel plate.In the embodiment, when the thicknesses of a vessel steel plate formed by bonding surface layers made of different materials are continuously measured by detecting echo height voltage values of an ultrasonic response waveform using the ultrasonicprobes 7 from the surface l
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