| http://www.w3.org/ns/prov#value | - The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is an elevation of an ultrasonic thickness probe in section on a central plane; Figure 2 shows the shapes and relative positions of the contact faces of the probe; Figure 3 is an elevation of the probe in section on the line III-III of Figure l, omitting any representation, howev
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