| http://www.w3.org/ns/prov#value | - FIG. 8 is a graph illustrating the relationship between the relative value of the output voltage from the detection error correcting circuit of the signal processing circuit, which is one of the components of the apparatus of the present invention shown in FIG. 1, on the one hand, and the distance (l) between the secondary coil and the inner surface of a pipe to be inspected, on the other hand.
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