| http://www.w3.org/ns/prov#value | - The plug section 10 includes a casing 10C (see FIG. 6) provided with multiple slits 10Si (i=1 to n, where n is a positive integer) detachably/attachably accommodating later-described blade-type contact units 18Bi (i=1 to n, where n is a positive integer).
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