| http://www.w3.org/ns/prov#value | - Because the enlargement of the insertion portion 5 of the overtube 70 is inhibited while the inner diameter of the first lumen 3 is secured, as shown in FIG. 24, the first magnet 71 (identical to the second magnet 72 and the third magnet 73) is disposed by being partitioned, for example, into magnetic pieces 71A, 71B, and 71C at locations other than the locations where the electrode tubes 18 that
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