| http://www.w3.org/ns/prov#value | - The securing pin 21, which is formed of metal such as brass or the like, includes a embedding flange portion 21 a and a securing flange portion 21 c which are respectively formed in the two end portions of a cylindrical-shaped shaft portion 21 b of the securing pin 21 in such a manner as to project in the radial direction of the securing pin 21.
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