| http://www.w3.org/ns/prov#value | - The heads 502 a, 502 b, 602 a, 602 b, which are similar to head 102 in FIG. 4, allow separate engagement mechanisms 504 a, 504 b, 506 a, 506 b to be applied thereto to secure the fixation elements separately within the heads 502 a, 502 b, 602 a, 602 b.
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